Malicious PDF — malware analysis report

Static analysis result for SHA-256 395f1d3f6d6dcc9e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 15:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3f3f6f5b0cd39b1194bdb593f6c9789 SHA-1: a6dc7527dcb0e63cd7f362e62cc4680ccefddc2a SHA-256: 395f1d3f6d6dcc9e4021dc4bee6484eef673ea162513ced0659b3f8acd589228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://archism.ru/uplcv?utm_term=click+assistant+apk PDF link annotation
    • http://dolekkoyum.com/admin/UserFiles/file/zoseripiwebazugamikuvef.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/86379838579.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9d69701f---molumezobododo.pdfIn PDF document text
    • http://synhbio.com/upload/files/wozeguz.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6a76d6abe8918fcea656bb3304f8cf60/dovizokifimofekibi.pdfIn PDF document text
    • http://acelybio.com/upload/files/16366000643.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/fekoravesijivefividepu.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/62784166884.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/jekuxul.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/sogasibenujeg.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/valujusul.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/27130639430.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/bivoxuzupovesepabasi.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/lemereduvexone.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/soposarugidilinepiwenu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/80682401485.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613024c06d913---64974989753.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/60326480076.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/736744888.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kuxezevuge.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/fixofagedogovij.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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 10140 bytes
SHA-256: 1d4e92b657fc204c250554ffebd0d3ca84477ea6345d0a9490de438c530a5b8c
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 18644 bytes
SHA-256: 73f92798e685774771197810f8852934bed9a7f91118b398877c525f986d4960
font_02_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1