Malicious PDF — malware analysis report

Static analysis result for SHA-256 677af4fb0aada55e…

MALICIOUS

PDF

83.1 KB Created: 2021-07-06 00:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ed45a7c3ad34604a8450e0ba8901f480 SHA-1: 9fc8f19c3080c29f7257db16e18a94b0c261f756 SHA-256: 677af4fb0aada55eb9ee959cc52cd268f5bdadd3725c736965c60e917f8aa74f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites, with one URL specifically containing a 'utm_term' parameter suggesting a phishing lure. No scripts were extracted, but the presence of external links and the phishing detection suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://infrive.ru/uplcv?utm_term=chapter+4+test+b+accounting+answers PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091188bd7040---69682443653.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac90a6cb6---33277648360.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1308cf0fc---67005450316.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/f4bi6qpsn6g24vq5oag1hjm6jt/8621919070.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c186f015eb3---bexoviduzeritogefe.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530ec6eb1b---80361201648.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/a03f68fdec9e3e94ea814cda3637fd44/regeb.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607248d6db9c5---18248988805.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6cff9f0c1adbda02e9bc033c25c0d906/tabeligixuwekabuxonarivoj.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/25977780438.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/4901489277.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/kixototewowakavu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768a2916c2b---mesozaseneg.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/vofoxudalebilevodu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6f1a1d5b---96174869057.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160704e49ddaad---24888561699.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/98732377825.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/90424672793.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/39201835493.pdfIn PDF document text
    • https://inncredel.com/uploads/15886728764.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/bizurepir.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607132a77eecd---kufigesogodujejofozu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/70801072595.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_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 16932 bytes
SHA-256: 894ff9d61b5c04a2112f7aa240965a1a31d7dc1302e98f81a0021e2133990b48
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 11040 bytes
SHA-256: 1141e2f2e0e668979e19f716bf40f1bd8ac13cc30105c3d2765f2d971423f4ec
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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