Malicious PDF — malware analysis report

Static analysis result for SHA-256 94288660a952f544…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 18:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd39d07819c9a2fa289e5f67cf9f136e SHA-1: c49cf7d9decdb31e9fa58d94a14407636dd73b15 SHA-256: 94288660a952f5446b6f1d92b4fe2d5da5394bd67f23eab9a9141eb1d93eb78d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16144b95beee2c---viwox.pdf In PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/45780225762.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/wedasezegafezilamad.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/31541252936.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/46207039572.pdfIn PDF document text
    • http://poiskvod.ru/images/file/91190615408.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/90620415307.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/vinudojipotobu.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/33667721734.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/zapagowasuridase.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161447bdc3354f---510433762.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a191b8ec---93752370073.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zozenalikojumekopaw.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/51283303362.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/98483403686.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/dukak.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/83665230188.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/47857533829.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///10633273434.pdfIn PDF document text
    • http://pbpharm.com/upload/files/64695798497.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/fiwuguvaxuwodo.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/9686435724.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/88755576066.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/98292525133.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/razipapiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+gta+3+android+gratuitPDF 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_off0000b028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 10480 bytes
SHA-256: 50ca7f38622cc58077e99442a32e7edf445364d736973d8a3b84370fcb865f51
font_02_sfnt_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 15020 bytes
SHA-256: ecab66297e6c9e3dd3ff32399f64fe8a42997ebcce608a177ddd48122b503f77