Malicious PDF — malware analysis report

Static analysis result for SHA-256 c339443312afe065…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 02:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 69f8bc8664a266c1ce2a0c2cf833d7a8 SHA-1: b50a6dfc5a6439781fb79a41175860cbb0a22cde SHA-256: c339443312afe0659e03e73d42774bc10db01764dd89654ed56516748758dd80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/av4djpmhga5i4agleregmu7btn/62914377768.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/87340799616.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/12210835469.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/labiruwewebevatipoxi.pdfIn PDF document text
    • http://thevalleytrader.com/files/joribajipuguv.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gexogirunatatigujox.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/73551292480.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/pekagivelom.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/15976348268.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37053dc7b---zezubolugij.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/43350903477.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/18821111412.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/24404751494.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nazabelidafuxuv.pdfIn PDF document text
    • http://goodmax.ru/i/files/jogatowunuf.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/40518050024.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/28dvfjrthdr2o9rmpe2kfblt0q/39752089031.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/jorovifejaxisat.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lelubeselezijenib.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139008d79ba0---22416349297.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/mesomadatexenobera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=save+contacts+from+android+phone+to+pcPDF 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10980 bytes
SHA-256: 161b677da39a7fa5af0b4dcb109f99e2f1fe3a18d6ca57a99281164c7e67df4e
font_01_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 17912 bytes
SHA-256: 25243511e3180861db51899c2450c97575eeb465d22c32b68821bbcd32d6033e
font_02_sfnt_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1