Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d22c297b4f2ab79…

MALICIOUS

PDF

82.6 KB Created: 2021-06-29 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c28b989ed276788c250a8dce19adc717 SHA-1: 196bb75778579886ddcd13a9029f242a04765faa SHA-256: 3d22c297b4f2ab7911fdd3b3efa217db3e03fc233030c39c14a182be58de146a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body was unreadable, but the heuristics indicate a clear intent to redirect users to potentially harmful external URLs.

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 http://aite-materials.com/upfiles/file/guvivu.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9ea6d75c---mojawonedunugufidijida.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b68979054031dcd41e894748061a2350/sulumaw.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7d0c0bf4---julenesonoxeko.pdf
    • http://ahcxdq.com/uploads/file/290624385930.pdf
    • http://qiuyutv.com/userfiles/files/20210528070359.pdf
    • http://carzip.biz/files/uploads/files/zixodefamasosigunuvopi.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/jujijipakaveji.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/82853190817.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/m2vvermpj521e2jlh3t9epqtp5/jofomagulunuk.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f7123961aee458c128b123905e220f48/pizojixiwasagoma.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nvmiqj9hcheni5qd53uu92gog1/99072632760.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/a9f869f5794e6243ae6b3744b7e36e86/zuwiseropisuzex.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504002632709953.pdf
    • http://cestovni-postylka.eu/userfiles/file/ziwovunu.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1724f152---3078413579.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3594adf101fc8745fec7261fef4dc2e6/87578947313.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607689a345a4d---76703780063.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757123aff93---samerisedowiviforol.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820a229d0cd---65837811876.pdf
    • https://angelsstaff.com/uploads/file/bodabesirujef.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5v1haequcli24u4s76lfq1ds8u/94624627105.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=right+shoulder+subluxation
    • 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_off0000df48.bin
c2ede23323c34705ce3a7232818a60bd68a03c39cd23598497663ba210d94249
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 17144 bytes
font_01_sfnt_off00010c42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 16792 bytes
font_02_sfnt_off00012459.bin
ac3cbb6fe1f388284eb4b11e1cd5a987d385693652e2e18444687f2ef69bc19b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 10916 bytes