Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a2dabc03abee86…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 21:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0357955acc6ca88dcf49344c1f168569 SHA-1: 0a7c2384894a8c40542505e32c630c8f93b40dfb SHA-256: 80a2dabc03abee866b5b874fae4af4722f6ef9c37b608c77cdb15a671cb91d7a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with heuristics identifying it as a link farm and pointing to compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=the+complete+guide+to+asperger%27s+syndrome+pdf+free PDF link annotation
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/47365400546.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/66438457704.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/19133139886.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0a0098dcef7d9f1e66c2ca47ed2217cf/jelagi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612afd1fdba91---fidirifekusasitipip.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b126c90e260bf3be7bce5a4708324520/sasapakefanuk.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/labemepavawesenifiserud.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/37864931519.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/72192066452.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/wilufaxazotaraketupivu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445cce66ea---76546794892.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/jafuxatibifum.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/lukuwinowifujetebenener.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/10014688326.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/40993444839.pdfIn PDF document text
    • http://netart.hu/userfiles/file/32732297625.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/363f80ecfba797286509cecc5e37597a/14393835602.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nmji5ssviu62q7t9p3cmb2k19p/wapiwena.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/fumeluvidekona.pdfIn PDF document text
    • https://autoparkalbanese.it/file/jedajagenu.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/3842255316.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/63e1d46fd33b0ba16653268c6bb9a8e5/97376643757.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/basasotogebo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd5b176c4---dikikixenuveteginidam.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/finilokesuwutak.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/xoxoxufatexulux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 18528 bytes
SHA-256: 82455b7262e8a3753ad020b22de71298c17990f65f52ca8eb9739051e61294a0
font_01_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 11280 bytes
SHA-256: a51a979289c85f521c5d2edc1e207ae5e223bd4085dfc755fb0d3d8568549a8a
font_02_sfnt_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1