Malicious PDF — malware analysis report

Static analysis result for SHA-256 a041bdc9d652518d…

MALICIOUS

PDF

98.4 KB Created: 2021-09-06 22:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cd6a8c460e2471f654830f1e1ab0814 SHA-1: 55db30840a3a9f7b34e53be824d2ecd30f7fdc24 SHA-256: a041bdc9d652518d609ec85531481cdd4cd371d5416fa13440c003e4b7d01c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic confirms links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=methode+simple+pour+arreter+de+fumer+allen+carr+pdf PDF link annotation
    • http://patroha.hu/file/joxawajosifutut.pdfIn PDF document text
    • http://fittbikese.hu/files/file/67259177130.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/zokedefolavurozi.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/44893821778.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43a1990c9---30021650183.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4bd1c3c0b8db70925930af532f14636a/10069086351.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070857b04c6e---xogazube.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/89682608961.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/87659142404.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/58631727245.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e5a6b12a---18015793390.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/91099092369.pdfIn PDF document text
    • http://poorclarescork.ie/images/vakaxevofupiri.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/gujiborizeri.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ffe7d286---darepew.pdfIn PDF document text
    • https://webhosting4.net/media/file/nonadipe.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vvpuavii3lnbjf5khp2en6h57a/ladasuwivokilorogi.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/1529191303.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/wuxijupenizinabev.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d642e17ee4---28166614374.pdfIn PDF document text
    • http://portableandcool.com/files/files/67921793275.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_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 21572 bytes
SHA-256: 612677ca1d77ab565bc703bef7c8f3667bbbb2b353cf6efc78b581d2e3ecbe0b
font_01_sfnt_off00014aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C5 10976 bytes
SHA-256: aba06e14af747d9802f42dbbf87ce71398d402b5da97f5d5015a311ac2dc9415

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