Malicious PDF — malware analysis report

Static analysis result for SHA-256 082d4c7397f81841…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 14:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2531888647bd87f2b048eb437d998c2 SHA-1: e35a17f795d9f5c350f7f60ed16e7ffc460d7b55 SHA-256: 082d4c7397f818415bdcfac4ec17765fa29d191eda93f60c0c419d191c13dd5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and external detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=one+point+perspective+in+art
    • http://gandolfiarchitetti.com/userfiles/files/nubofelakoxajuv.pdf
    • http://szwygs.com/upload/lusedawujujibus.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d501e0563e09539e813a80951977f249/89026299233.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/zexavisebujerigiweloribuj.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/bmamhqspabe942lare2uhfe9qt/20727807319.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc121897c90---zazirisiwe.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb64b58833---xonutinematinononi.pdf
    • https://bem-sa.com/img/file/90774436242.pdf
    • http://eperon-kochersberg.com/img_db/94714361493.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/cef9a1dab665609f4432316eabe48a6a/jumelul.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83d5b4b85f---47900030900.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/agkrcln3rf4c2old52equua1k4/12691156227.pdf
    • https://aimhc.com/userfiles/file/zemubu.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429152955247308.pdf
    • http://aircond.md/upload_fck/file/duvidemifisegiva.pdf
    • https://jokerprod.net/userfiles/file/gakivivote.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d9a80df---47048538554.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff6fbc9b7b88cace0aa894d32f329bdd/kawurowiwufakinumaxi.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6973fa9c---46639983904.pdf
    • http://sun-tes.ru/files/file/81059299162.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b23adfc3---refozosimalefalozidedazeb.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a079a19169---95423191053.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c235b330ca---19038635585.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7491429c69ac7b4ed66d4a2f2a1f5c71/15198787820.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_off0000f375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
font_01_sfnt_off00010b87.bin
263b2b80542a6027d487fe0a62be3cc245b106bc2a2b01eaa1d06896930789e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 17992 bytes
font_02_sfnt_off00013a1e.bin
684bd6a33ec295262e6bcc2f1331eac0f9fac371f1e08288c43c33bba12e5a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 10412 bytes