Malicious PDF — malware analysis report

Static analysis result for SHA-256 5786fe5a31bd3ae6…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 07:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a48d0db48e9f54ddb2b0113be2669566 SHA-1: c34156a2a0f589f517ac5940895ba60c078c9c7d SHA-256: 5786fe5a31bd3ae60f2e2201dc20197e23a95b7fdb91966baa8e890e6bfc37d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160945a31aa4d8---2537003219.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nhndfjtmc71a6cbcvlsr4femo9/91304226529.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/91884486583.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d206e9c0---xowezovofopugipunivig.pdfIn PDF document text
    • http://school15-tyumen.ru/f/82075107230.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/51844867814.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/sofaruk.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae88f417ea0---79715996572.pdfIn PDF document text
    • http://anpo.vn/upload/files/nukigofupukuwi.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/pakixudexob.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d119565aaf3110ef03588d518d6bf258/nepan.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b50fbbeb3---60684630892.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c5d70b7e9d655abaa8c9526c7013180a/91548019537.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbdc72df3d---61391555931.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/34883311843.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/punemudegu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/457f5dacb122cc65c8c5a708eeb6c197/87899128878.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zexijanedemoxejisisute.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5b497653---74702057857.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7ea7a76b6ec4d56889c7bca3de6d2505/tusovapanaxuguzikekuje.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83912870304.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fuvomexefa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77df25a0c0---xuzugupiziwid.pdfIn PDF document text
    • https://ebooksweb.net/files/file/47834200719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=excuse+letter+due+to+sicknessPDF 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_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 10480 bytes
SHA-256: 36cf5a5f326bdbaddb3cba7322c32184ce50ad3a3ad8bc4d41e77d2c296c8435
font_01_sfnt_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 16200 bytes
SHA-256: 1a1b2d3f63e9621cd49a7f6cde9467fb8e8703c841f079e647459bb6541516a2
font_02_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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