Malicious PDF — malware analysis report

Static analysis result for SHA-256 305ef8cd5cec7d66…

MALICIOUS

PDF

84.8 KB Created: 2021-07-16 08:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63e44a24e607ad0c6e0d7a8201758d69 SHA-1: ee409499c7b7327c0a8208bafd39075add005a32 SHA-256: 305ef8cd5cec7d6692ceb6c0fe2b0e13ed1953c9afcd59f777631666b2729f78
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://findmealocalpainter.com/insurazon/admin/userfiles/file/waxefusizazajodevetogusox.pdf
    • http://kalmi.ru/upfiles/files/99867088402.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a62937e8c6a---69289348720.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa2341ba85---23116760550.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t36ednolv5v8nqefceihq36vl0/86505496549.pdf
    • https://lysgaards.com/ckfinder/userfiles/files/metagorajitu.pdf
    • http://viettranslators.com/webroot/img/files/watatawajinixaf.pdf
    • http://wamer.org/userfiles/file/gojetew.pdf
    • http://dzstock.com/Upfiles/file/38898235310.pdf
    • https://traicaygiasi.com/Images_upload/files/mitozag.pdf
    • http://dhf-china.com/d/files/21427368419.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/39784c255fbe60f765c88e7788fbadbb/75015030623.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c3fc298bf---85135932524.pdf
    • http://benthanhsgfarm.com/images/uploads/files/pamokevepufupirigofus.pdf
    • http://laxycoffee.com/upload/files/54054603743.pdf
    • http://grupophi.es/uploads/files/vuwikixur.pdf
    • https://cowichanmusicfestival.com/userfiles/file/2234108305.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde9bbee34---32117367489.pdf
    • http://lamelove-zakryti.cz/userfiles/file/vipiwazegopudisin.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/velukogusodisejenal.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kjf37l3iv2ko5hf4prg4kkmcd3/musenemagadatiw.pdf
    • http://borisovhlebprom.by/var/upload/file/gusupezofamojexigok.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b49a91ae---xakowib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=generic+structure+exposition+text
    • 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_off0000eb58.bin
2ff335c156f053addb3973689fb221ab00a6fa461b39a4a9b713466134422831
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 10400 bytes
font_01_sfnt_off00010315.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 16792 bytes
font_02_sfnt_off00011b27.bin
1e81629153e1ab8079333c68a7b3ad788f9726bf495e79d32dc830766aa157a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 16744 bytes