Malicious PDF — malware analysis report

Static analysis result for SHA-256 374364bc06d4a414…

MALICIOUS

PDF

82.7 KB Created: 2021-08-10 03:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70ae4df6f660a07bbe623e7a5ace5640 SHA-1: 55bb56507c6ff2b278a5868c3e832d922fc96d5f SHA-256: 374364bc06d4a41438d56867ae0e19c2f7f34a48f1c3c55b9d46a6fd77b9d39e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing lure, prompting the user to call a phone number. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=fedex+tracking+phone+number+australia PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0431b8ab889bb56819c515fd409e52fb/lavoturatedopovunijinulo.pdfIn PDF document text
    • https://totounited.com/contents//files/40758546451.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/58581420955.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/7218306554.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/jilujijibobubamiparano.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/73459721585.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/lukejabififejod.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/42588009922.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/lufumo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cac3f726ed19c5243c2e370e2c35e050/voxivazo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/80f0e7c99bb0822a53c9a191b2dbc196/62292834658.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/vupadaf.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/72655ccb6f17900dd8453cb2fe033505/ramegopenadarovowi.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/visesobiwuladuluwonive.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec50b6acdf---88278096264.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210707_240D4FEAECAC506E.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9paq5f3ai316sdngtu7j191pk3/wujodato.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/22367548d43131470c1ea2f7298abeb8/79910201139.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/fiwofefusutobuba.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/72295726395.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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 11372 bytes
SHA-256: 20b599e016dcf88802283607bae7d954741c63bcf72dba3344c5b0adb651bdf2
font_02_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 16568 bytes
SHA-256: a53706c63b26d2509c7e7a711edeef558ae2e0ebf478fde32635444b54407fa5

Open this report in the interactive analyzer, or submit your own file for analysis.