Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1f740f207604eb…

MALICIOUS

PDF

83.7 KB Created: 2021-08-20 21:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca4db3eb73c4c1afad52eaf33bd1bb6f SHA-1: 6abccc9d3b67b32da066187df78c36f4b4916614 SHA-256: cc1f740f207604eb157ca3de5344dcb6ab6050c26ba8958067d7652cd8889090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan imply a malicious intent to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://lt101shop.com/userfiles/files/puluzusotikewawezaraf.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0436e834284142d6771efe468fb6195b/98573971401.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/bexurugijiban.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/9197080782.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/sesotasosujiva.pdfIn PDF document text
    • https://starbox.fr/img/files/49846391547.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608001ee89006---13316105861.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/40640534752.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608501cd066d6---12732342930.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/28734731867.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/69317929327.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/maxubapesurarax.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f4b12f3ff7a206f2a05dba67a2e85fd/jezosotitijixaxonomexuk.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af09a811085---lipidorofazeziza.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/75929731933.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/76278e4752154817d3427b7d080dd85d/kelawovikimajuwokoto.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/e76o83tuqufoddb1hbk5ccgfh1/71541990258.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/2780511539.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759fe41c07f---54499600429.pdfIn PDF document text
    • https://plasy.com/uploads/file/tawovul.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/baxumujiwejiwokazebifa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/trfaeb2jrjvo6tsah00uvqrr7n/37076423834.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/wexegilitozofojukopab.pdfIn PDF document text
    • http://arslanemlak.come/file/93022055625.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad61a00043b---16544026161.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0ad56a51---sebimaxamebevupesadaxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=invitation+to+the+lifespan+4th+edition+freePDF 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_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 17148 bytes
SHA-256: ed019483a7c0e6ecb5b5b9beaf5893a9aacc7e82e0c0c55850ca10dd64aaaa3b
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 10692 bytes
SHA-256: b465858defd181d7d3cad2a686a69961a3cca61d38ca60faf94cc7332e74dbe4

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