Malicious PDF — malware analysis report

Static analysis result for SHA-256 c463335a004738cd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 01:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e29bc14bc1c560a82f11ec9d50babe65 SHA-1: 01f3dd7478f5cb48387b47a0a69cceb55b5861fe SHA-256: c463335a004738cd54146a07cb86c578c6cdf353dcd92c3b61bfed38fdcd1f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alwillislifecenter.org/ckfinder/userfiles/files/18241497110.pdf In PDF document text
    • https://mongolia-volkslift.com/uploads/files/vitaxu.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/53051257598.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/28253025144.pdfIn PDF document text
    • http://annabarons.lv/files/files/nigufuzanevojupexawisux.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/98106666557.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/dutuzosepunivijufalifalel.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/14344322029.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/32099589548.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/pesujawowefigak.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/lumobuvafodiraduj.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/22688020960.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/46442410656.pdfIn PDF document text
    • https://ratosatu.com/contents/files/romeka.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tisifu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2d8bdf298ed3620ccc105056b3fb74a2/1058613995.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133115db769b---water.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88c2cc657---25500310807.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8ffd62b7ca1df39a4668d1e74ae5802f/fulegetigevix.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1a0b4f4d---999052329.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/55972647835.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/96d3b2ac840b1616ea8523a0016251c1/tedaluwomox.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/joxonapavowelutaxi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/piderixemosavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=spider+man+game+phonePDF 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 17640 bytes
SHA-256: e0f6058b77e609e9e43e9f559e442646ea8e4b3f6e84218c171efaf41af97bb8
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 10604 bytes
SHA-256: 15aee9989c852d0cff79fa5a28bd69ff6ddc3b064cc0bbf39f9a964b6d8bc7b9
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1