Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b1805225b25d1c…

MALICIOUS

PDF

91.1 KB Created: 2021-09-02 05:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50d0d6dfa5557a7cfbf00514d78b23ce SHA-1: 4bde15fcc2d3af9b3ebd313adfd18baf55c56ed4 SHA-256: 18b1805225b25d1c0ded14eed3ee6d957fbbbf31a952c380def40774d5d4b695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into phishing scams or download further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://synerhu.ru/uplcv?utm_term=life+path+1+and+7+compatibility PDF link annotation
    • https://maxflowfans.com/userfiles/file/78783516412.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/54096159898.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7772b86a93---lizikofon.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021082206054685.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083019244ba1---11176598723.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aa2c1efe4---72372774349.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/lepibe.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/86941254787.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c370368a408---85395492123.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0769c81fe7---67264208045.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/valolak.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/bogovimufi.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/novil.pdfIn PDF document text
    • https://bio86.net/fichiers/94804861826.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jesakenoni.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/xelapezuwisisenivelij.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b959deb4---rakupegiwonuki.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/xedulikukuvagiv.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b769739b19d12a8bc8f6bcd36cc3b434/91961722567.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/70207808553.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/27964904447.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/32643985034.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_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10932 bytes
SHA-256: dd370ae3d4707dcbd13a59053165d6ab5e53d5dc157ae45f5b5b5a17965b6b17
font_01_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 17964 bytes
SHA-256: dc0903762d0fd3f3077211da82a1228560edd0b432a19bfefa288bcbdc1d78df
font_02_sfnt_off00014570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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