Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbc232eca46d953…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 20:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85ca2082789871e08d87fbd05b263ce4 SHA-1: fb4cb68359d2b5247e55076893e4d2ce782493c1 SHA-256: dcbc232eca46d95319e64c87fbb94572b1f085176945f6370494ba2d806f248f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b1f4606b---sokewemavavawo.pdf
    • http://chi-kara.net/userfiles/file/70702968049.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b6823a074---58414105707.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/rozowamuxasiten.pdf
    • https://liniagdanskzydowo.pl/files/fovodubewobonaxexike.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/435198cc444c976817bb236ab54ad181/2714913040.pdf
    • http://notarbrazda.cz/userfiles/file/25168952740.pdf
    • http://anandtouristcorporation.com/uploads/88958309320.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e249fb3c---gutozofimutufifemisikifax.pdf
    • https://vsetinrally.cz/userfiles/file/26069704067.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/l4scs7tsu19pjdonk0hrvphrql/nifopilapubi.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/afc4f38badcfec294a02cc7ef893b9db/bidubodovojakejegu.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/93574b7eaf55b4b3f13e4de0394b2818/47404960846.pdf
    • http://eska-lift.ru/userfiles/file/bigikekakafi.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c58b6e17734---zewojiruranavixuxafik.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5ssiv8vobk31lm55ojirss9oe7/3507934909.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/003476e647b88b4df3bd434cafb918e3/49284401222.pdf
    • http://alexlunacoach.com/img/editor/file/30388818719.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a676ae872---59303083754.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2e73f4e2---37676745272.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/35393101151.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ef775395d---6828142063.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2d8b55e5---vavevuxiwamobarizisujemak.pdf
    • http://tyextractor.com/d/files/8312071446.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+day+bleeds+and+tonight+falls
    • 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_off0000fb4c.bin
afdc0fe7b0e9012d3e3f635aa986b2767d99b1828c4f56eae5f4a828590a0a24
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 10748 bytes
font_01_sfnt_off000113c2.bin
2c18e84f06b38bfdc8cf8e68fa0290e5b748430fc58db88109bfcf9097a93f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 18396 bytes
font_02_sfnt_off000142ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142EF 16792 bytes