Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7538a99e3e862e6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 14:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e883b96a7c7cee3444e47a748bb7aecc SHA-1: cfc033967c0233ded66fee00541372f9299f1b3f SHA-256: e7538a99e3e862e6b3e81d0fe48b1ee726649d56966ea0646dadbd88a6f387ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=android+studio+landscape+only
    • http://levant-tekstil.com/other_files/File/xuvew.pdf
    • https://limpiezasinasel.com/userfiles/files/jujowifegizimajuze.pdf
    • http://www.oomewatersport.nl/upload/files/mabegigivomiti.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/47375919386.pdf
    • https://luatsubienhoa.com/upload/ck/files/4212072675.pdf
    • http://vistobrasil.net/uploads/file/xatolitivumotajederuxod.pdf
    • http://goldenmallbiotech.com/upload/files/pisijuwatufosatirudafu.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210907/1523185499.pdf
    • http://clinical-pain.com/pds/userfiles/files/60689518301.pdf
    • http://realcomfort.ru/content/upload/file/dejewuzovosefurokiviz.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6158be624bcefa3ad34a00bba6473db0/12744986543.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c4bb7be7---74506161532.pdf
    • https://network-italia.com/file/77677422649.pdf
    • http://andlupa.com/userfiles/file/7843651817.pdf
    • https://hkfew.org.hk/ckfinder/userfiles/files/lijoxuxojituvovulijumoti.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/vebonabuxagaravikalazi.pdf
    • https://duocvinhkim.com/userfiles/file/55777250934.pdf
    • http://bbfrontedelmare.com/userfiles/files/ketalasusadunidofoziwisiw.pdf
    • http://unionnutritech.com/upload/files/48864647705.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/pomowuzujisavutir.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5a4319b5---mojedigadavunarip.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/75098312796.pdf
    • http://ch-bovi.com/upload/files/57629398895.pdf
    • http://fixafilm.se/userfiles/file/zunavopovisu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54f.bin
c691eb0c6651e0fa3d854d15ce325c1352e6087236ed075527c60de8687a3ece
pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 18424 bytes
font_01_sfnt_off000105a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
font_02_sfnt_off00011dbf.bin
62b6556c2970a4ebf0e158c608369704447e1348c82843296db5dbb31cea35c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 10700 bytes