Malicious PDF — malware analysis report

Static analysis result for SHA-256 651c84059faee24e…

MALICIOUS

PDF

96.1 KB Created: 2021-07-04 07:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a980857648e230aed57d4d3ca0d2089e SHA-1: 7f78a145112cf6077590cc251e2478b8d9ebc5bf SHA-256: 651c84059faee24e30f9e4afcfc2ce95c9c035803866eb7626477d91f9b5b922
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious workflow designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b0g4h6jjhn2q4mret792obvr9o/labafovogakiwavope.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ab3ef333c6428f4e5e89fc1ba207c343/30691860839.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/cf0bc1e35a8ffb1009909ef2b7e97a00/8408037178.pdfIn PDF document text
    • http://apcmagon.com/userfiles/maruvoxomama.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4aba6ac49---loviv.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/lujazetojujitobajin.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/21869435596.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621134613.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bdc19b08b06244e5ef4d4bb3d0e4aa9/55851682623.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/flb5s2r65ts7o8a8mrv6bjuoc1/20440778594.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607544a34723d---jukasojiga.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3954c448430d60c6859173a891fb945b/kepugagirizijapomuxefugor.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/xadaveliguwekadabezogo.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210602100346.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160906ab82814d---rozivoxapumodibose.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/42648487246.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/28280336942.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210702030520.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/rapugusemupovixa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607053cf56aa5---kerorarebofav.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2ca036307d022d06d193da1e85204471/gefan.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60cbb49bd0.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be870e820c---zojujob.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c21660c7bf50a6a63bfb0cab3d147a8b/rebugitux.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f642a6deca---21214650346.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5b4e47ac---banemamunidezokajamo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cefc93ecf---lemepibexinaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=zack+snyder%27s+justice+league+online+free+watchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 11272 bytes
SHA-256: 1b6d4f40a01e81b161ceced36c334e6a453651f3948d47e5d7315c64aa0b017a
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 18372 bytes
SHA-256: 5818328d63a72f56c181cd480147ec0608587f9987838184c64af7c4571af2ee
font_02_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 17196 bytes
SHA-256: bf206b3562ce0d3d6bf4a456fcdb61106223e053f069e850ebcd55834e398807
font_03_sfnt_off000150dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DC 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb
font_04_sfnt_off00015941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1