Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e5b606628231eb…

MALICIOUS

PDF

100.2 KB Created: 2021-07-31 06:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6752cd7a04008a87c16f0acecdc83a28 SHA-1: 80913d9a67fa3296351e0c5537eb609cd6791b88 SHA-256: 40e5b606628231eb4f33ec7c9013431f07bfa9d1982773c010c3653500e3f3b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=game+of+thrones+plot+summary+season+8 PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec5235308---guvudabijapazemaxiwapeva.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/15337228287.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mafq0rqb1io5ecelamfqi94s16/31896137214.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/59621934913.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093a084a6c09---konemelejaxobukegidesa.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/lapulodi.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/xunuluxijexogenuxixut.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/fafokuzegikekasosotewevix.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c958a1468a9---83163631096.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52e3d7be2---kavas.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6a96bdd3f---zupewuguxozefoto.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/jijedepuxujefodimirenimep.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edad15259bd---wupodeluvonajim.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a78f3dfe---36758174993.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/36863926467.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/71815253009.pdfIn PDF document text
    • https://edarky.net/data/file/fuzoresi.pdfIn PDF document text
    • http://xtra360.net/campannas/file/suxedadapebopulakebinukel.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/45661744530.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pajobekemamabejesawi.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a316e9dc679b7bd75cedf60ac78e45cc/wutama.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610474a4a9e55---63148799682.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/48f40a81cd4950065a862c1eebf78ff0/51688500581.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8caa1eab8---godelevunajaxuwujume.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7aa1bee7---77242865477.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a8c3f23d---jerutipurari.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_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 18508 bytes
SHA-256: 2b1141895db2c5b171e00fa2b19a2a540ca3be7b0b78850f067f8489212097fb
font_01_sfnt_off000150b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B7 10992 bytes
SHA-256: a48ce5b4fc02816a1bff5143965271679dcc0013b61a78169a1e93625bff5b92
font_02_sfnt_off00016a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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