Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cb5b2bcef7a3ba…

MALICIOUS

PDF

69.7 KB Created: 2021-09-20 02:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26302555b8a3c6261a8153173ae7db8d SHA-1: 183d7c2d415acb5ab4bd02309a5261616e73b411 SHA-256: c3cb5b2bcef7a3ba067f1029928d1fad129e1ea632d41b43348db074326f32d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://skipjackpoke.com/ckfinder/userfiles/files/jizinedafutu.pdf In PDF document text
    • http://www.szphotar.com/admin/img/files/nebanefogoraw.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356e746a395---20326882641.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/pagojololarazax.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/figukoruzowamemanidomu.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/28107832236.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/6526032932.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/20512148520.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a8b43aa5---zisafexemibenu.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumikadanes.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580f3dd70b---rukepusevijepibipepug.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210920_033417.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xuponobedutuzupuzokepojib.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/rizabefotonepado.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/kavabakosexuwi.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/saliwakatogenobibalugev.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/40779536513.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/49349478218.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/83344438931.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/58042340634.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ddaa6890c---25901109519.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/rizumedewonugesaboweki.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/mesunoxijurifebabivudej.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/31139485618.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/venubupotopenanale.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/gedojasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=samsung+galaxy+s21+5g+vs+iphone+12+pro+maxPDF 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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 11364 bytes
SHA-256: 979599e42ac0cd1893ae87cf02d925c20a97a5f7a63717311c1ae4a2ee3b19fe
font_01_sfnt_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 14348 bytes
SHA-256: 14a9bfb6e99e013a083a50e3585b0d193411240a62e302afc7ba2177e6ac4648

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