Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c5c00056cfca19…

MALICIOUS

PDF

92.3 KB Created: 2021-08-15 22:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46bf05271bfc316d87b74c3aa768396b SHA-1: 4ddb950892b79d6112c6963ad38f7f8259791c74 SHA-256: 35c5c00056cfca1923bab0a8f8f7c4cbef16ff9308bb9b48001d761162d98905
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains, likely to lure users into phishing scams or download further malware. No scripts were extracted, but the presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=how+to+sync+xfinity+remote+to+element+tv PDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80df2cd25---xulumogedaxiko.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/82246027274.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/posojixadofenajenuv.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc69fb31---wuzubavojojivosebewarakaf.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8bd2ab824655b9769ffc6cb6e9699fe7/jotedazopixu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/becdc18e08f44a9dee93ea739f64ce25/11451452653.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/60289730933.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/99119507225.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4629mj0cn3pg4bfrjhtas4l3r1/xavugo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102dbb9bb48f---71826382321.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4efcf30272ceba14523f99dcab524390/25768784396.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/darazuzesanirirafeg.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bf0a3f42---fixugedizidaxubigakekeve.pdfIn PDF document text
    • https://ksboutlet.com/file/files/rijotilokupelola.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/81047450158.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/dofavevabovupiberatibifu.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/88795062086.pdfIn PDF document text
    • http://www.bandungmesin.com/file/9982267384.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/r6a2ip6vmifo7gnbjelr5d2br5/wezenimojuzuzudabux.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/jonuxifipa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/88725810b4433382bb718f17d515f1cd/68812102003.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5ja93so5rl4cre6dubicnu3go3/37282961906.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/batijapogozexawoxodi.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_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 17384 bytes
SHA-256: 9e75afbf265c48d30b4b8802861c513328aac98bc884046f2a43a7a339c947c6
font_01_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A13 10696 bytes
SHA-256: 4c739239d3c2bfd5d1b99e616b22ac4eac6adc898d451f353aa23c14b25c3467

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