Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2b717721897194…

MALICIOUS

PDF

68.8 KB Created: 2021-09-06 19:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f401e6e72aad6705fde54c859ca91f2 SHA-1: 5f0555090c9c068009143ebecbf19d21e1aeae81 SHA-256: ac2b7177218971949f828ae10bc9997ad7fa9a7dfe7f41ad46384d90b8a32378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://garglob.ru/uplcv?utm_term=catalan+language+book+pdf
    • https://luyenthitoeic.info/userfiles/file/xugalunozegisaluzedazut.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/59619e9296908dd053592fb959da4654/34028323731.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23f2b195a---refupivujovimobopo.pdf
    • http://peaceinsrilanka.lk/userfiles/file/fuvapaduvabomilobi.pdf
    • http://zkojicin.cz/userfiles/file/21305825385.pdf
    • https://chezgregoire.fr/userfiles/solazasivexopavomozamub.pdf
    • http://adveotec.com/img/file/ritigun.pdf
    • https://oddluzanie.net/userfiles/file/rusaza.pdf
    • http://teusz.pl/UserFiles/file/68960092792.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e179beb0---papopegasezulowafu.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dnhjffef6eisr4tsnbds07qbp5/38212541004.pdf
    • http://myphamlulanjina.com/upload/files/tidujuvokaxogak.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubeporuxe.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/49072939390.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b431c1827f5---30135218747.pdf
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/pixepibiguta.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/wudozulusire.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/dowotiporararafoga.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607749ad96694---kemuguse.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/zaturiz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eedec93d9---mufemotosolikuxejow.pdf
    • https://egyediajandekotletek.hu/mvc/userfiles/file/godurakebamidulutusa.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3f6ef108926926e988d1de90207faef4/bureguwomudupex.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/jupovizapisusajorakufedel.pdf
    • 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_off0000b147.bin
a53f1c4dc03c776e74d3bff0487831d8588bdd7fd837d95fe64f53661bbbe4f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 10676 bytes
font_01_sfnt_off0000c986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 16792 bytes
font_02_sfnt_off0000e198.bin
fd4d61a4f94a6ffa79f0290cb9efd22c7b7a6aa3443073dcb12cd9db009f4d17
pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 14584 bytes