Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ece616a39580c4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 21:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd8cf5328fc7ebacaf8c6ff964b0b4c6 SHA-1: e603014c3b74e00e95ad92ddbefc549ee0b189c0 SHA-256: 49ece616a39580c4c3ecb64dfbd35fd6d0f32f03eb5a38730ef2461c52f2f1b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. The primary attack pattern appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://botaierpharm.com/upload/files/kijetofunenibugema.pdf In PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/3383570573.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/acb1c281412fda9ce1d3d4341d18986f/78268877444.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/26399548397.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/88790680333.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109021812109706.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/wiwutowoxovipeviriwozu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161420820911e4---vufidejowejikugatife.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/88387019214.pdfIn PDF document text
    • http://agrion.org/upload/fichier/10971302441.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bf18c60e0ad49ab4a1143c81107de719/nazamexirafekufujamun.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/13245380522.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349f5b43028---85253060434.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/sozosewuwixamiredoxi.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/kegelawufuzosixamor.pdfIn PDF document text
    • http://alltechsro.cz/files/23506485080.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/talewizedomuv.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/zukizufanoperazarotug.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///xerejas.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/41082639906.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c918b1fceeb9e4c58defdc33602fe67c/dujajejofoduzikixajan.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/25899599834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=te+regalo+lo+que+se+te+antoje+pdfPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/pusokubaji.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 18244 bytes
SHA-256: 116120b89ce422a50bdf697832febfeb918dd5fd9d46d4f8ab668ea4ec992c6d
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 10920 bytes
SHA-256: 489a787cc0dd776659a6386333cec8f9cc6620c1dab19dba0480ff5168a96e3c

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