Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9199f42d5214b0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 14:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb03de7944fbecd6b13e265287de3f13 SHA-1: 79e4b866baa6a2d22daade933e3b9b30d6ea0f87 SHA-256: 2b9199f42d5214b080d23cc969e8ff4cd09522008c2b2d01a144aaa08dc0c054
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains multiple heuristics indicating it is part of a link farm and uses a password-protected archive lure, suggesting it is designed to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further supports this. No scripts were extracted, but the document structure and heuristics point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://sakaryakasaplarodasi.org/userfiles/file/zokozizumow.pdf
    • http://vanhacollection.com/images/files/zositekojaxuwazimu.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/45fd91f7d911a4d6dd1665210fc2af91/menufuzabefixizatofanet.pdf
    • http://jinistudy.com/_UploadFile/Images/file/60315434896.pdf
    • http://metrocars.london/survey/userfiles/files/roxofevabofakir.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613750f139210---36592220019.pdf
    • http://z-sinpro.com/upload/files/jidafejigafawelizaporar.pdf
    • http://ranaghatpchsschool.org/userfiles/file/mebodugeniliruxubumite.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/gotuwibekikevo.pdf
    • http://visit-pune.com/userfiles/file/girutazig.pdf
    • https://viceda.com/userfiles/file/lafimufogovigabumumadujo.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/xikixikagokodewavadodad.pdf
    • http://indianspringhomes.net/userfiles/files/waleresavazul.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/xibenefedew.pdf
    • https://argumentua.com/i/file/63152772033.pdf
    • https://pasarangroup2.com/contents/files/19825413541.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8073d70a655269cb18ecf46441ce4f80/2337937974.pdf
    • https://tepihtrava.rs/files/82656678223.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/92508562772.pdf
    • http://ajisushionline.com/uploads/files/41585567917.pdf
    • http://www.saletime.gr/admin/fckfiles/file/vojuzad.pdf
    • http://spbi.cz/res/file/67672504508.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=srimad+bhagwat+geeta+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_off0000d692.bin
4e1dc5efc3587942518022edeaf7d3d235afdcd567001d6b68a8478baa04de61
pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 18248 bytes
font_01_sfnt_off0001057c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
font_02_sfnt_off00011d93.bin
3af88d753e68d20e32deef64591e03953bdd612db3fbf0f441cf5bf649a525ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 10808 bytes