Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ed145d0f5e2220…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 04:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e867987b7eafc017a59cd9b07d848075 SHA-1: e134aaf8062cd09187555a62f0f05aad8d5099bd SHA-256: 24ed145d0f5e22200675c5e65ed3d54994383bd51f723af9f4c2c7523ff390ef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=hill+climb+racing+hack+version+apk PDF link annotation
    • http://kfoodntea.com/dataroom/file/xabuvusokulejamimalikixeg.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/neseboriguxuwebujebo.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/bubumuteromijonurix.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/69539256888.pdfIn PDF document text
    • https://iwistw.com/upload/files/46105522620.pdfIn PDF document text
    • https://lorus.rs/files/miluli.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6e8ffcd---87510508156.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/rimixu.pdfIn PDF document text
    • http://envigest.cz/upload/file/gedosibakoxop.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4b62343614cdf573da7ac7af38e0d5d1/jamimukagojimagarep.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/ladegulawafekosifitekalo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/740kvd71pu3errj3d100r6rju4/71128699106.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161355c97cf7e9---81761651518.pdfIn PDF document text
    • https://blv.by/upload/editor/files/80703851956.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/4915295657.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/xejupinit.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/getumusijokufevitenope.pdfIn PDF document text
    • https://businesslife.com/content/files/84552309151.pdfIn PDF document text
    • http://dentherapia.hu/files/file/62872607825.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/dexudunejeleguxusajediza.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/50637711038.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/76548358347.pdfIn PDF document text
    • https://tl-systems.hu/files/files/78351979047.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qtao4a6gfetl4kn9q50tnpnmrn/tomeduzulal.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613487e73c652---34427991462.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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 11012 bytes
SHA-256: 9eca0cb55041685433fcecfbd25ceb4a9abfd64c450842c44e20ebbcc9232b51
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 17296 bytes
SHA-256: a12925347249f101c1dc908855cd9bd03a2b46716fce215f3f28fb5c3c993558
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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