Malicious PDF — malware analysis report

Static analysis result for SHA-256 3646233dca59874d…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 17:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0724ab93ca320a039135efc405f44dbc SHA-1: 97c7a9e43f0eca01708097b6a7904d587ded6bf9 SHA-256: 3646233dca59874ded98dcc22b70622eeb9dfa7663ee701c649c0541da664de6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a payment redirection lure. It contains numerous links to external PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://mojahotels.com/ckfinder/userfiles/files/50517411651.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iib88h31jjdkutsr3n7b7bcf4j/muxituluzosav.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b43cd28c266---duxezajewapasomodubudef.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f9efcc53bb3aa5514736d221cc5dcb4d/busofotapazativ.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/17de8e4cff72482d8a7e56fd4966d8ea/forotenibakalebojusuw.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e7f4b31308be2e210205542c8ba769e4/90186505664.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq8r9c8ios19j5koq09u21tkcb/vowubafakutasipelom.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/32707937711.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c3t9keojjr7b893qkherdk2cpc/zipesoxidimolubojaxeluli.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/oqgjfsaipthm2q3v90kicn2gf9/voxesagi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6406085eaa---22770605978.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/5542609329.pdfIn PDF document text
    • http://apple888.vn/luutru/files/95295670679.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c88df941---miwowuxaximivuvonu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p01itech29jp71b0tivd3l364l/wuvoxiziniwobik.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210619140906.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vg9gp497he6kr70honjblhllc2/fofavivix.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c478bcf7---jenowowutogatibek.pdfIn PDF document text
    • http://dzbnf.com/upload/file///katezetiv.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/16291840787.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a99869621b7---69102497165.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/33720868832.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/13l32cke8ra9gdjktin9t9qv2u/wanevelopovevadovegodep.pdfIn PDF document text
    • http://tuvanthietke13-5.com/webroot/img/files/josifotegofuvoregobipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ps+now+7+day+trial+codePDF 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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10612 bytes
SHA-256: 28e412f3b5389ad13126fa75bb6284807b96e020c2b74e5a3123fa121156eb35
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 18136 bytes
SHA-256: 73a5ba09801a15f70d617b9207f229cda2a08e5a57f4324dcdbc561cb6884639

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