Malicious PDF — malware analysis report

Static analysis result for SHA-256 449c5debb097f0cf…

MALICIOUS

PDF

77.2 KB Created: 2021-08-29 23:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a76aa62e7d493b375cf48d496887b8d5 SHA-1: eeb7af21c2c65fd5dd56ac27b766d35ab7841e93 SHA-256: 449c5debb097f0cf60c5702709021b8becb38783f5fbce45b93010479bac7fd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The file's structure as a link farm is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39997628e2---25727870617.pdf In PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/supajuvo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17df8af236---jeditifulebutiwete.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/wexuzaxodikimopivumemig.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fee0a16e9---mojujitudepareputuba.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/30495257299.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/5161019622.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/81040105774.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kalanuwere.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bisilinese.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b35b34b5996760ed8409180982736876/27787453589.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c480a825047---77697155009.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/zutosugolujefujibukutov.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/34240829045.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/cdsjl6k5vsi2lidn2citn6hhv5/janesijuwefez.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/musokemivelixunoxatiwo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/44695711128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vgs+guides+10th+class+pdf+free+downloadPDF link annotation
    • 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_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 17824 bytes
SHA-256: 77b1ce20895caa42d3912d320d226dd30be15884e4ed37b55f804bb2e672ce8e
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 11228 bytes
SHA-256: 93813fb356efeaf9b751c87ad74784774773dbd297ccedc13a6c0760cefbdc23
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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