Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fd8dfca2627c13…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 05:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28f313a8e752b337e2d4b4aeeb13e889 SHA-1: 7d4147abce47ffa1d1b5af7116b8bc5cbcd2b87b SHA-256: d0fd8dfca2627c13793ad834ada7b3274e75a36e133e9244d3ab69558856008e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=download+tomtom+app+for+android PDF link annotation
    • http://elitakhealing.com/ckfinder/userfiles/files/femevimekodezaxule.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137aee15105b---28133029451.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/85254760708.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8160eda5---99398053007.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50814822549.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bolupisowonuwa.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/lurufowiwebusido.pdfIn PDF document text
    • http://skupka23.ru/upload/m/85902333703.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/15288476545.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/33813980061.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/76866268133.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/vajolav.pdfIn PDF document text
    • http://186086.com/upload/files/sosamumetabu.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/24973219417.pdfIn PDF document text
    • https://naves.cz/res/file/24165199415.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/47867969351.pdfIn PDF document text
    • https://sambelteri.com/contents/files/kegujod.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/rawokuzosifepedita.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161318fe5a0a82---mamulonurirup.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d7efd91a89f148bbb54c22c05473a551/zepedomeziresegetepa.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/91366524734.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezurevog.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_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 21728 bytes
SHA-256: 63e6090136f77e3919be150c8bb868238c6b9c4e645ec4e285ed79ee6d46fc64
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 10444 bytes
SHA-256: b372d93934172776ec35eee3db71d1437b3d5cb062454ae7f9cb602c96efb5b1