Malicious PDF — malware analysis report

Static analysis result for SHA-256 5171a091cccbe683…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 07:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e52234696815acb1d5979a277a54e71c SHA-1: bba7fdf5cc1e5f75156ed73364d2e2d8b603dd6c SHA-256: 5171a091cccbe683a4a87f88fb251f2123bd7ae850d54b3fac5d1bf74ad58715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection confirm its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of URLs like 'https://catamma.ru/uplcv?utm_term=download+pokemon+nintendo+ds' indicates a lure related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=download+pokemon+nintendo+ds PDF link annotation
    • https://stl-log.com/htdocs/cljr/data/files/vosegaferakobod.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6bd2fc52d54c3b03a297826c9581d165/59945916178.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9e759332---94756127451.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/67770077203.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/22922497505.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/situbozosujasizerijaz.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/zuzetixasalulir.pdfIn PDF document text
    • http://attlas.center/userfiles/file/25782234012.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vedosemotuwudujobeberi.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/22126352014.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/13958124330.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032745e219---73044563113.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613166480d46c---58850321894.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/badozemoz.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///zejuj.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/dagekakawepewur.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/81360334508.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/memokalitobidonokife.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/ribiragidamewemep.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/73778596655.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8a144a89---38967013053.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/79143933494.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/10055148204.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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 10632 bytes
SHA-256: 014a0ac3902def1d2a1ebb0ab4426b379c952630e2324a582f51724522bdb918
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 18152 bytes
SHA-256: 7bd527273f6c4c43da10f7407eae1265b5b9e4ca22977e569dd59838ab546414

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