Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85df779ab9a9495…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 15:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 606a903503c731b68dfc56e4c812e208 SHA-1: 87a351fb50ccb9ed923629e44d47810b19c7dac4 SHA-256: b85df779ab9a94958ca8c8e53cf4097eea1fcb8ee0f6fa7eae20f0e4a26072bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing or malware sites. ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=tds+all+journal+entries+pdf PDF link annotation
    • http://qunjl.com/userfiles/files/tewajejalosajoxelavukilok.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/15146860698.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/bubas.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/95951639737.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608878ea381bd---71363547194.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768cbac76c3---71185171264.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/luwotinokijekumigumepaj.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/zitarunotefakuzidobuve.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/kifaverumupewabodexakizix.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/ginutixuburejodu.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/34349808837.pdfIn PDF document text
    • http://fedime.org/imagenes/53145366467.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/kukirutokutovaminu.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kuxoli.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2706d4d07---fixokivokerewe.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/dizefodobopefa.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/zisogiwijase.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/54508936195.pdfIn PDF document text
    • https://kultmotor.hu/images/files/23677966735.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/xometixoxalipoxijawexuted.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a755e25f4c---91804970044.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/mozovowetefupo.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m6aeo813rpgdfb66l0a1if7iu/59220933695.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817876be480---vikonowe.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/mogaxusekatotodofo.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 18068 bytes
SHA-256: ef6b1d8fbe5296a41e714e11dd56bd98004442ecbbb0aa51afc3a01faa44b10a
font_02_sfnt_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 10684 bytes
SHA-256: 93247e519d19dce50838c11785403c8a2231972c74bdb6e9ba29119ef3666c70

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