Malicious PDF — malware analysis report

Static analysis result for SHA-256 7823492cca10870a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1c886b1f0ba851ed41a197a32b60ad0b SHA-1: 50e15d44516a8b0b6596838fe612fc2fe55cd33e SHA-256: 7823492cca10870a78adf2e202dec7bf3b6c7befbfb01c4fc90c8bcef6d60351
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Session Tokens

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a lure for multi-factor authentication or one-time code harvesting, consistent with credential phishing. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://oniceh.ru/uplcv?utm_term=reviewer+for+pma+entrance+exam+pdf PDF link annotation
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/zirikasigigavolijus.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608494bb98816---51125336409.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/28044548639.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0d7cb892d858e31303511ecc174c8d91/30057668540.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/48437357734.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/jawisewikesikeruta.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/12376477967.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/79574930589.pdfIn PDF document text
    • http://hrudolf.com/userfiles/xomemamepapokesijepet.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d63f769e4---39965187030.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c81c57ecb7a4511317ea9517e25c4da0/73270205337.pdfIn PDF document text
    • http://entrackintl.com/uploads/17208956056.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/demepaserilo.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/91095023392.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/dipitusokepapaf.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823dfc3dccb---tepopimuwogibilufusab.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806127ae1ed---79941947345.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c818059c8a---vaweguwut.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb55cbbbe---dafutexegaja.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a64e301af1433b504f109a9d8d34384d/22550393603.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/10023488472.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112fcb04c30f---vokijiwusetololu.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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 10868 bytes
SHA-256: 0eec47ddfe4e7cc1cb8f159a1cc27749dfc16900b77047e527ded461dfbe9e7e
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 18992 bytes
SHA-256: a9afad491b1abea5fd68b8c8d485edd167574fdfa18f3cc393e9dec234988f7f
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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