Malicious PDF — malware analysis report

Static analysis result for SHA-256 334942d3ddec1740…

MALICIOUS

PDF

105.7 KB Created: 2021-07-04 06:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: aafa3ae2c767b958b44093eea6ed86df SHA-1: b54bc60c5ceb25ff6f8f114338c89c8e7389a8e4 SHA-256: 334942d3ddec1740a5345bd8b0b1fbdd6148dce71ff00f94e1cba24dc3e44c3b
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These findings strongly suggest the document is part of a phishing or redirection campaign, likely using the embedded JavaScript to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7ce111269eb38ac71405983bb5d54101/93014484117.pdf In PDF document text
    • http://candientuvibra.com/images/file/vinajela.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/66660226092.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/59497672017.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954ae6aa445---31473573033.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/p61gsod0630eva6ek0u1mjecm4/66084654681.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a065dd24cf2---monew.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7ci26ldq7trt90o1k56n4m66v8/febupalepizilebego.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9jank0u7flgn0grtfh3q16496k/timatawopife.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wemivejazuxow.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/kukotanizigasaxazo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9a79a139---kawojowasikulobatubiwoj.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/947ad72611c4a6be0271cc480b9fd793/37368544606.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/riramegenevibujesana.pdfIn PDF document text
    • http://asvpp.fr/pdf/sitibagi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mubatepirotejupetilusa.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088acbd2f91c---78424192781.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a028ae9cd---pufedupeladenofagetagawa.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3d5cba54---2631643221.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6tbf0ru324jpqkk0juoijq95n7/34702686497.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afad7257aa8---metipufepidas.pdfIn PDF document text
    • http://armanetti.com/images/fawutetuke.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/198fa75ab4783287e2627b027b1d1e7a/53667946880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+authentic+guide+to+russian+and+soviet+camerasPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 18996 bytes
SHA-256: 8ab0b1e5d1702f5178fbc591da1a4bfd03d304ca2fe516a8d7deeeb62f51056c
font_02_sfnt_off00013cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF8 10900 bytes
SHA-256: 976828b1e2b3649d584c068da53ea0017064c3516dabcf32df04e723ea0c2f8c
font_03_sfnt_off000155d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D1 22472 bytes
SHA-256: b4bf2004bde8634c5de47604db49e078af18e51f017adfe846ff2a5b38adb162

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