Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6354f2a6cc3547…

MALICIOUS

PDF

105.8 KB Created: 2021-06-29 23:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3304d56c0e24ba54ad74a30d0516ed18 SHA-1: 9bd38f7351a546af20ae3f51081a7b4f415bf642 SHA-256: fc6354f2a6cc3547362d253e2427c27dfccfb8f401f6dbf728db951cb97df58b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and links to compromised WordPress upload storage. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer. The link farm heuristics and numerous external URLs point towards a phishing or credential harvesting attempt, or a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://datatech-int.com/userfiles/file/89452443972.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160830486d3d8e---doraxenawajileten.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5f68a2cb06a06fe8fafb5bf40a6138bd/39142104016.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6090282d3---kumizarujijodo.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0f383408---vabufodabexizinijizes.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/55158083580.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/zituxetopitizowifeb.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fcf7d68cffa53ac0665746eae6869667/88926460461.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cag19lpckniplsv9nrnq4942i5/52047213588.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1d7582409---zemamijow.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/34743584875.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4d597a0e---17207991469.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4dea53a3---41459159153.pdf
    • http://footstepfloor.com/upfiles/files/mememekojidarenesetufan.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a464c043b88---bosaxabujejakuzegi.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160700ff2a1cee---17212565582.pdf
    • http://langmoon.jp/js/upload/files/71939061796.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607596c61f750---41495044600.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0be802d0dcb45a82be2f0af86fc6a48b/65383543489.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b4a0bd6d5dec7fbd2839fc618be04246/36871655885.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/902407a2a695d805abe300b02cec9c2d/20463303733.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/20989061981.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=strange+quiz+questions+and+answers
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6303e3772a78e027dcc509df78c6bdee/32859104479.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013880.bin
a10242c9c41b63c37222a9774d64a9c472e1c4b345723133baf7e40c4418f115
pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 10844 bytes
font_01_sfnt_off00015138.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15138 16792 bytes
font_02_sfnt_off0001694a.bin
1ac21fb85ba57d0e7e90b5beab9ea3b2d58fa501bf23ffdf2540eaf80cf01932
pdf-font-stream PDF embedded font (sfnt) at offset 0x1694A 18412 bytes