Malicious PDF — malware analysis report

Static analysis result for SHA-256 b858679e50f561f7…

MALICIOUS

PDF

90.6 KB Created: 2021-07-23 13:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99653311295643406b09f7906324a578 SHA-1: 04927037149a7fdeb9ec2e070a8123b4e3fd68a9 SHA-256: b858679e50f561f770bf7c19f9632a7492f19b7e0f4cd1d73ec7b73f2c283d30
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b21ce7c82---ketebudijenuz.pdf In PDF document text
    • http://buergerforum-tirol.at/file/denorosugiza.pdfIn PDF document text
    • http://olympusflights.com/files/files/seraga.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/pifebi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/041903394891.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210718010318.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/60206960180.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/lelonizitewezifidiro.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/32670858588.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caac022259---58892507075.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/wetajiludalede.pdfIn PDF document text
    • http://atomleasing.ru/media/File/60733174588.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7c56283ce---22991524595.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dde7983b---vonipajugawexotudewig.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/61e1ca7cd44092c653f05a3ee781941f/dexepozaduv.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921714dbebd---xobalolipo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b8e4fcb834296f0a6693ec5a9a76c097/likeno.pdfIn PDF document text
    • http://jucal.es/images/file/mirazagimaz.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/jedukaviripawetibofon.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3281f820ee---govixabonejukatiz.pdfIn PDF document text
    • http://iphysiology.ru/upload/68275396524.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/766cfcdcee07bb84303d0ac7ffa195ea/9919726388.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4ff310a84---38603993602.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/wakanidasul.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dacfef70da6---735358363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=one+and+only+desaruPDF link annotation
    • 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_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 10288 bytes
SHA-256: 919d90cea61b11cb3565751963c92a7b04c63913310f61e7cc023dd9e5ec0be7
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 17652 bytes
SHA-256: f263cb68775e3f4c36fb263e52f2ab79a48f6e2228ba57e1a9d3d8f420d1a8c0

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