Malicious PDF — malware analysis report

Static analysis result for SHA-256 162339ae49dfb8f8…

MALICIOUS

PDF

116.0 KB Created: 2021-07-24 14:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3466342401694bcf4b45e01be77f5efd SHA-1: bd85454c479015d12d35ce29eab3d6ec754ef775 SHA-256: 162339ae49dfb8f8b8e306853742d08f846f9c7290222cbd5b1b43a16fcf14a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f5e85cc9---janubitasume.pdf In PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/19540369569.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rumewudanixewo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1a7c63455d438ca24ff325440caf346b/65562509774.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f558cf51a7b---rivufawulij.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mozup.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xifeweditewafelexoveb.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/nenenupudenusi.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/95881696586.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/17258424645.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9fbd8b1cbe82265d51b331c8ce776374/jiwupipuvibe.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031711542537.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a4c08c64bbdc1603eff0d2699f7fdd6e/17150701874.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a9f77cbc1ab641974bb54f69bd48fa6f/72904997285.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e8e8d8c5---sesopesikok.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/18999908513.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/91f24f49b15e888479bf2beb7f0f4653/38026476453.pdfIn PDF document text
    • https://panama4d.com/contents//files/33329700093.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/serolopekusolumosefiden.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/34675440915.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/57f3c91271cfa7687725dff8f8a5617e/rijufenozawemonanedodater.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/9675012371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+i+play+gta+5+rp+on+ps4PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000164ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D04 10652 bytes
SHA-256: c2f15b5d4c574b5045485b30c3ce1b21a08103f0ce08e9bc9869d3598b195064
font_02_sfnt_off000195a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195A4 17212 bytes
SHA-256: f0956b84202b640191856baae47a25525b1bcd88d8d5895150793340953a24ee

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