Malicious PDF — malware analysis report

Static analysis result for SHA-256 a595838193f3e251…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 00:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c0604a3e0490e8aba482fb565f50be7 SHA-1: a89e467ceaa4c192a332ec187d39eef291707d7d SHA-256: a595838193f3e2517e747b2e815a7ad7ed30d8c80aca1431f8206153c643f050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan delivery attempt. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic profile strongly suggest the intent is to trick users into visiting these sites, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=demande+d%27attestation+de+travail+exemple+pdf PDF link annotation
    • https://cncunse.com/d/files/31498394588.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160733b352ae7c---7020652306.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/44849268029.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102dd8c2b5b3---87196015629.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b5642b5f---27049516067.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/97448051846.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/66825149555.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d14b04c066---ladipofob.pdfIn PDF document text
    • https://edarky.net/data/file/jelumevotawefe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072161114635---bipidutejikamezudutaridit.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f93a0346---notawokekevarerisu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/putararosule.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nifokemepuravimagazezafus.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126c765d0495---fipodiko.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/09e941f11b1a7852714d0b673ddf13df/wejoto.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ft898csqrmof1lg5cna10122/kivarugubopebuvinejivuwam.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/wusugozininex.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad52110975b---gevobubuf.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774aa7301d5---bolorodizarifeviner.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/lanutapemajiwu.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/59868469955.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/37938568423.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2rn4g0e3hkqi349u2bdvvt6i21/76406324353.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0vq2n39017rl9q06mirjvr22l2/gipelotikojabusobu.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/32890552406.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/557939a2e31e8505269bc855ac0e6914/suwuboxe.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_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 10860 bytes
SHA-256: b00b016ee389d8f4addbc3d715c19aaf54b5e3fc864ce7ba25e3503407c74c09
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 18856 bytes
SHA-256: 3633790ab8ce4555e87596b75075e074429e28483bcfa44622c00d3bc3e3fe33