Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e56ea7889401680…

MALICIOUS

PDF

70.5 KB Created: 2021-09-03 21:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f17af8b7cd07e820984e7c962cc747ef SHA-1: a55ccf98b575c3cec6324e39029e626ed2638fd1 SHA-256: 5e56ea7889401680e81456ca8ac316cea70acf6cbd26e1720e0b4d12379a53ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the embedded links.

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 http://mikomisushiwc.com/uploads/files/mupesosurop.pdf In PDF document text
    • http://cesurmakina.com/userfiles/file/luvof.pdfIn PDF document text
    • https://faprosid.com/file/64711355184.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/95683220520.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d8836d58833314a5679e9f383c7956b5/66941852045.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608772d9093f6---8543433460.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tewuwisipuxewivoweburi.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210719_161151.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7eb2du0mqj67tjc51dvdf38vq0/43007741245.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nirokoj.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1817c9b5d---zolagobet.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/xewub.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ad25a0a87681a5d3b8b2cf486fc0adfa/13688320214.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/tawazatokida.pdfIn PDF document text
    • http://stylekd.ru/files/pozazufewuzose.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/77259966900.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/21885670051.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b5e9a230---somet.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/bomawopakanoxowegew.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/vanatuxibusefe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/680585d880f6f71c9017e443b6a2628a/patizawavujuminoza.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lanewofomar.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c45791c5---wabazakukiwanemeramag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=colostomy+and+ileostomy+pdfPDF 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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 15508 bytes
SHA-256: a2d6108a8164cb96f9013f39d7c51b7dfa899a23f66779680e2828d169e34b4a
font_02_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 10704 bytes
SHA-256: c068fa441f27c7c814c1969245b8ed87306deb30d3d1538fb2004c8cf2ae3a4d