Malicious PDF — malware analysis report

Static analysis result for SHA-256 94103e17c55e93ff…

MALICIOUS

PDF

95.9 KB Created: 2021-09-19 00:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c7ba17cd5cb62e6ef9f9c9c2b100a0f SHA-1: 1469d939c67d4dbd9239f50f1547722e71272ddd SHA-256: 94103e17c55e93ff3a9c688a002f771a162d1b7130b715b437abfc1d875ea077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a deeper analysis of its specific content or intent beyond being a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=friends+reunion+streaming+putlocker PDF link annotation
    • http://alwaditrading.com/userfiles/files/pofaz.pdfIn PDF document text
    • https://pellevah.com/upload/files/34044984193.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/65159013032.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/zekaxo.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/lefotawajad.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/89368ef66df1663eb99da14323df2228/39321992118.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/79928543919.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/82184335267.pdfIn PDF document text
    • http://nature-revive.org/files/file/96169237200.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/fesotusazefigalunafaj.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/7899608913.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109010031028512.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/9815428272.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/36824114358.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/mezujitawidawodex.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d804ff0400e78dcbabfeee724f9a515b/migubitinotatibejetexutuz.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/64034397494.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/ketukul.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210919051033.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd3fb5648---kagunidagororiwarelu.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_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 18364 bytes
SHA-256: 01c814292227415050e0047a2451748716c601aae8eb74c8572d2a5ac241c452
font_01_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15963 11024 bytes
SHA-256: e837075495d7a8db200e1ed3d95c038c2f5c4127f367e64c9c89bbfa1ab82640