Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1f3151026b1f3a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 07:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79b656e868e991cc0ad12370ae11f571 SHA-1: 3425a625723b88661b60da585b319a3537c7513b SHA-256: 8d1f3151026b1f3a864ec6e06eb6376b6385457f9de750d8b58b410e3db20125
284 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious activity, including a high ML classifier score and ClamAV detection. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. Notably, the document employs a 'Recovery secret / private key request' lure, suggesting an attempt to trick users into revealing sensitive information. While no scripts were directly extracted, the presence of numerous external links and the nature of the lures point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=vault+apk+free+download PDF link annotation
    • http://theclubburger.com/uploads/files/68921248441.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/xugisifix.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7c6c1ede182b04069f9db810daa49765/fezogokeb.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/71262103043.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/busukanov.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nnrar4g1aa52qis6rlkqc41l1u/zupasevejezasu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/diveropafujafog.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e27c466604---kuwenewipusotakotum.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/11196721632.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/9801664354.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d0b2c8d8---66098377929.pdfIn PDF document text
    • https://isosklo.cz/uploads/tefemuke.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/58239281660.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/8099731257.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/lufowibuxijoxelofazemub.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tifukilulebupabixijij.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/xipulobak.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/nikosijovixejusiviruki.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/81848252093.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/wororozeliruvelosolixe.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/liwiwegikovomojuvexovawu.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fofagukiguka.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sovaregibanufakononogegiw.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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 10480 bytes
SHA-256: d8634959ecb5da0245394fd31ec20fc194c0e28fc68dd3dc24585ddf48ed8b64
font_02_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 18832 bytes
SHA-256: ca62c964ee051124711f6e01f3297ac45d7d36f79e0e14e1c331353b1c9f0ea0

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