Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16e663d2c44bc27…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 10:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3206517691933ab2b78880ec9fa9aa80 SHA-1: 9fa401dc48ef3c56c60018ebd99716d6d391b64c SHA-256: a16e663d2c44bc27c8ac9ba4f68a35da8a7606df94c29f1cde8f539ee330a440
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://speakingparrot.com/upload/ckfinder/files/42241592608.pdf In PDF document text
    • http://sun-eko.eu/files/file/xebezadimesabas.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cddbd8e08---degegoj.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/magefakifad.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gimiduvoveje.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8e1cf3f05085877730a055f40fb58564/vonikajifilepa.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/98611538952.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/62340854534.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/f4fc024qkor099jipri29pkohq/suzivizelosuwulamov.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/78661656015.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4ee9bdab---38349823305.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/josipivoxoxorevewu.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/ladulexarotipatefane.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/sixatidokuw.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e31822f1f2baf0412466a4ad421f13b2/wepafebemenojegum.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210917_DAECC94447F9E879.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/zegigiz.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/dejogedopunifufatu.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/98903504820.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/norimiritizuzirig.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/60432073786.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/83247129943.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jg2r5o1721v1sk1dkm6ckm27ls/fijofarefinexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=high+end+yaariyan+full+moviePDF 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 16960 bytes
SHA-256: e9bcc5a0a617eba60cfec1eb8d1b5772b112edc2ce06570d00a04a4fbe955c2f
font_02_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 10808 bytes
SHA-256: 16339a25fc242712663aafe773fc5e172efcca0223bc7bc3ea672b8babeb9dc0

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