Malicious PDF — malware analysis report

Static analysis result for SHA-256 2981f5eff347777e…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 13:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0b1df6bd8dd6258c76b54dbd1595cdcc SHA-1: ed24c40104e2e9050cbe48e03fd516cae1e58ca3 SHA-256: 2981f5eff347777e4ce38b9b1909ee82b9bdc6d79ec4beb91c33da6656766e78
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The document body, though heavily obfuscated, contains elements consistent with callback phishing lures, prompting users to call for issues related to billing or security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04a26c94b---4510528758.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/jebalorusesovef.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076312106d5a---wovonalajusid.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/3unbrb56j1iqj9cf5ui7fa9rn7/78781409760.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/q54si4ou218btmipl24j76sgro/zoluzimenifuwes.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/wowikededakagarevem.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/39574631862.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092594d0e8d1---vavulova.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/53054248128.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840c3c43399---76751595625.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160767bb744686---65455821806.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/251439855fa9dd09f5ace311fbd75bdb/20366256485.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/fafatavokojuwadolatuwa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pafuwoxalejozex.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0d3999ca5d2b8b7815f03dcc73a494c7/masepukivoja.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f21f8ad54b8e202b5d6b6a9223c52a7e/makepijuza.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3lj9o4v6sktbrdoisus1acfeic/kodaxoxafix.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q645405gkkptnejg7i2bljijl0/15739994604.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/057530c9a48054908bfd84ba42197311/sobine.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb29eb6559---67870204423.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210616_145121.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/49609378829.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tuxen.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcea404f7a---5478947566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=motorcycle+theory+test+costPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 17412 bytes
SHA-256: e485740c378458647733a8b471c736d97a32f888fd00ae4462da218b5849d1f0
font_01_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 10076 bytes
SHA-256: 3a8d2c94642b30e2a7c1894cd7e37aad1e65c2ccf8cdd76ab1198d7496ebec46

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