Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c97289a64a97fa…

MALICIOUS

PDF

85.7 KB Created: 2021-07-20 12:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba0c4debebde86e88b47a3af7854d29c SHA-1: aa02f2ee4661266e434c3b6300bba789c3959c84 SHA-256: b8c97289a64a97fad33e4cb6fa25637643f74ef4195536a05d99ed6fb311a87c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9554a84e0acd1db5cdf64234fa4687b7/rilikilabaxodusipe.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2ddd8affbf---xunigosusifiwaxaxobidib.pdf
    • http://ricarda-allegra.de/userfiles/file/puvabasutudumavunonov.pdf
    • http://studioturina.com/userfiles/files/butenef.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/4530563006.pdf
    • https://limmaginebistrot.com/file/govudanofetokiserasobux.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/06t4d15ckojno440q4m7rtttfk/vojagaketepebitil.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbecf7face---86356221993.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160992df441f8a---duzosonitawoporim.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/l1v8u50ka9j0h8ekr6elkl1b5t/jidopup.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5e55180fbecda1855237877f4fe182c1/tokidugixusodapexujeba.pdf
    • https://qpshouse.com/upload/image/file/pojekirudu.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086045986ba8---27563618455.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c77e3a820efb46079f120d3ee6421396/kozunilinorivusewiwoji.pdf
    • http://splogservice.ru/content/file/zovejudujuxajikipudaz.pdf
    • http://eaas-journal.org/survey/userfiles/files/87015467025.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268af7d4e6---kajulomavozezofiwu.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ef259307db26ce7c6caa9c3def477a80/rakotugaluvek.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexigasepezaxigemig.pdf
    • https://balustrady-metalik.pl/files/getem.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27a08e0ee---sadenazaritowixa.pdf
    • http://chnli.tw/CKEdit/upload/files/16324817539.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+plant+grass+seed+in+the+winter
    • 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_off0000eb73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16792 bytes
font_01_sfnt_off00010385.bin
709b1877d7d2b2b539838b448bb9964dbee5aee482018070877e6174205d073c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 17132 bytes
font_02_sfnt_off0001300c.bin
477c3a173f00ef76ee4a8a4769cb14e47aa171cea55232130c7d9a52dc3b25c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 11000 bytes