Malicious PDF — malware analysis report

Static analysis result for SHA-256 d872d3d27e3129a3…

MALICIOUS

PDF

86.0 KB Created: 2021-08-23 21:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6711e0bf686075a5398c12a80f12618 SHA-1: 405411a1cf00f656036c49e8294bf890aaa65690 SHA-256: d872d3d27e3129a3f8106a2641f027e0a2b8a847732050f8716d869b3193bfad
216 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress sites and external URLs, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'Password-protected archive lure' heuristic indicates the document may be part of a multi-stage attack where a password is provided to decrypt a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://drafthe.ru/uplcv?utm_term=san+diego+superior+court+north+county+division PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6cf94d14942c97e445bab0537502c71f/gidixidod.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/717743cdf590af6608604745b0a8aad2/18143281427.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/rogejukor.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/libofot.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120cbd70739a---92673737258.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f1829549f57a0eb824e741bc53400242/94896296010.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ea204989d---63583159108.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jewuvaxugoxesi.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/86973281531.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/kipumale.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/77276322881.pdfIn PDF document text
    • https://sambelteri.com/contents/files/romosapowaletuzoj.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/fefamonedigotekonujunu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121693e990f1---60135833492.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/kmssena9930ipt15ompfli0dje/76603314496.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8u5e2aekm0bm4sp8c0o09hkgee/12954505854.pdfIn PDF document text
    • http://zxsolar.com/d/files/xukutetujutuxemibagerof.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43c662d8d---24708837143.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/18817142899.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161152b3220d36---gurokiwetuxirirara.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/nazujujatizuganen.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/jobejulo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/281db45843d7bea75cc8bc2170141970/kawakanowipapusozalozo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb55cbbbe---dafutexegaja.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/26324491453.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_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 18028 bytes
SHA-256: d504e8d553581933ef311dc1014b2c641dfb0474e82a9f2857274a4aca4447ce
font_01_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 11100 bytes
SHA-256: ee88ee8a7071739ec18549d5f66cb194b570f3a89aee4863a12d5904d8bc0a48

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