Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1471b0f8a0d2c9…

MALICIOUS

PDF

80.3 KB Created: 2021-08-26 08:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b600d920884af3bd54ba3e94fbcbd387 SHA-1: c0a4d94b03d6b6e25913566e9e9461a0d056f09a SHA-256: aa1471b0f8a0d2c92418eeb6b9ee6251286ab6e66fb35264dc09511a263a2381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm used for initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9810

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=sell+scrap+catalytic+converter+near+me PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c62de7aed9951ac2c8b238a5219cb85f/kewef.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160895d5381410---xutizaketodasowetajadinid.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/96990931657.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/53072781856.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/42750036824.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c645cddc415---90643995341.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9f036a4ae6068cd5aa1e8c11a0ec41f4/sijotamekopujiripe.pdfIn PDF document text
    • http://talleresjpg.es/img/file/jaxegunavisubufir.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/69912902263.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/najojivufa.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/95013151357.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b839917c---ponimuzi.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/bidanaliluwixeso.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e2df5f72e---65720499432.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/wadadaxov.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/826917999cab15aca0f11266d90180ac/laridabupaxixalumevunilaf.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/gidosufofenuzute.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f579e32f9---19087852001.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6839ea2ed1---54950363244.pdfIn PDF document text
    • http://poorclarescork.ie/images/gurojiwelo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117bc7c4c5b7---46710172218.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/49897103799.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a3ada28783ffd2505c927324c4a7dad2/sisikaposaketixaga.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b591169157a---javuxemelamopik.pdfIn 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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 10788 bytes
SHA-256: 3e099f5d4cf275487ba29bd03fbc81781d373ae628d3984a5eb8320d6f727d31
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 16000 bytes
SHA-256: a9d1f9debd639cf8a4975acdb230a45f5544136063ca04f44470bdb8ad626827
font_02_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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