Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca96092790eefbae…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 22:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ab3a32cc659944648753a33adb87a5f SHA-1: 9d448ba315022aa23ef4624fbc03b45c6eb9ca83 SHA-256: ca96092790eefbae9fa0bf3090d59e4a87ee35ee23291ca873ab7a398941cfac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of 'utm_term' parameters and the 'SE_URGENCY_LURE' heuristic indicate a phishing or social engineering attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the overall structure and URL patterns are indicative of a malware distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=general+knowledge+questions+and+answers+pdf PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd9aed1b7---mavodadodukika.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210810_075349.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-15-21-12-35-24.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/10579811876.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/40349939115.pdfIn PDF document text
    • https://agros.net/uploads/file/96061924360.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/bekodexivu.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/pezudijot.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3044a5bcc---9127783374.pdfIn PDF document text
    • http://calisnt.com/uploads/files/keneposumedodofolivuzosar.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/28131afbe2d9d0c18a2497f628c9e562/61527924792.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761972398b4---55414992023.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84bd37f1b3---wadojegavib.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/wobaxojike.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/sinivut.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vufitinod.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a209c7c81bb---nonowu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7a80d27012beb562543ead1d964e29c4/39253556465.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/77992445583.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/60346641862.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/1947665642.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b6f2edaa---19264724982.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/wiwububakofamupigepu.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/fugefut.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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 17732 bytes
SHA-256: d501d67c8dd9cf7d45e8ccabac045f2c10d1246f2e9e292a733010171f8ddecf
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 11136 bytes
SHA-256: 0a389358e00282107f0adb3733dd360808bacdd4b4629c339928982595862167

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