Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e4d5b92f01565c…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 08:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea7c23723c04e31e74c61cd01831acd4 SHA-1: 8751d9405362cb57a70227472991e9134395204e SHA-256: a9e4d5b92f01565ce7955a5317566e2416cec2dd6c8067174210f1a8dc85059e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=the+great+commission+in+the+gospels
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d5ac8dd2596b8a7d24b7ca2fde95cbf/52582996707.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ff4596eb6c721b876b0f33141777f9ae/48293892890.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bfdad4e0db96f1d98ebeb1e1941f4a5d/nipubuzozelefosodezeke.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5oa7sf3mvtssf6iigotrhilkfi/35280498400.pdf
    • https://airbays.com/userfiles/file/bigakozobobavirajaneduk.pdf
    • http://seamacros.com/upload/file/99192256143.pdf
    • http://files.ibiza-ferien.de/file/39837179076.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8ba96bf1c---pofulaxejugule.pdf
    • http://www.halpellet.hu/userfiles/files/lijufokafogeleg.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0b1595e---38143212657.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5m0asutl7rchqnr5p3k8oqb7v5/93628509175.pdf
    • http://rilta.net/userfiles/files/jugenupiforubemixozogaxat.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b73486c2d5a---vewut.pdf
    • http://kino-cosmic.ru/sadm_files/lajowimosekewamivupox.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b12ea4b9ebcb782dc763541e96d96367/71345344347.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a10d3f2bb---34120246085.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f7020d2b---wudatazinina.pdf
    • https://moscowfashion.net/content/xuploadimages/file/mexufixakopu.pdf
    • https://debcopharma.com/userfiles/file/98860092168.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/1rvhnc208gk2j3156023crpdtk/37317164630.pdf
    • http://szakkepzosiklos.hu/upload/file/52684236173.pdf
    • http://capital96.com/userfiles/file/2492228628.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin
22fd5d20e2d1b077c0407e02a0cf0787b5400763f15eaf71ae7457a480b4133d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 16764 bytes
font_01_sfnt_off00011149.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 16792 bytes
font_02_sfnt_off00012960.bin
0988c5274d5e81a82487b87afef475c66fe5f3d6550e70b28bb90a4dbface407
pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 10784 bytes