Malicious PDF — malware analysis report

Static analysis result for SHA-256 4641f48fa656d064…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 17:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0dfa196c16c57572ec0a2548929c1f0 SHA-1: fa2b150effda8dfc0a35aec084cb220dceb2b4e4 SHA-256: 4641f48fa656d06410862c0f4e1cce735ace4d7589d4de90d0ce3c6288392749
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7309e21a20---69376679840.pdf
    • https://plagij.at/ckfinder/userfiles/files/jokewanejaxamelotenikofi.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf067de6d0e---sudarakidufixemuretufi.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf7c767f0---jivup.pdf
    • http://clasesholandes.com/userfiles/file/xagibafilumavaluxuva.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9edacaea43a823f7c075d76b7d3cd506/30926017809.pdf
    • https://giustofiori.it/file/59987372360.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/abump01scsm6hqrdmlq4nf7jls/76999627041.pdf
    • https://africanresearchcenter.com/userfiles/file/fajazofuzobemowes.pdf
    • http://akinmedical.com/uploads/file/97214905313.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/81933934838.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a8964e0361d08679c478c4fa0fafcf60/degozimajomewaku.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f180e803d75a196195cadeef45f2337d/14545943229.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gonazofuwik.pdf
    • http://zwickerfoto.hu/_user/file/90190276918.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/24dc7k13go009o4p1q8l7e98pd/83132046835.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be2ff3b032---79229984113.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe0ec1342---11828991247.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vevnq7f9ko284u5tmvhus5ahs0/wilobifipegubedenune.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b53ed7d3b---56404771607.pdf
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/m8e520r27v6un5cr75bn8ohjnt/75346852985.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839582ad45---tiruruz.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942127a818c---jutabid.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d09e05b1cb4e5e239e442794b7738b9f/refanerov.pdf
    • https://alakharia.com/public_html/userfiles/file/wokurosifefitopa.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e07d49d77---volire.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=singleness+in+the+church
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb19.bin
695319887f58b45aeb2ca1943d1929ea1405e590b059a99d9c92c3c76122d3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 10404 bytes
font_01_sfnt_off00011289.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 16792 bytes
font_02_sfnt_off00012a9a.bin
61dfbaf9176e75d6e7e8194af576b2afc487046208b9047dd852756082b37659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 17548 bytes
font_03_sfnt_off00014558.bin
95b7c6b6d9fb32ae4806ea2ec6d3bca0bf2da5c8ba5704e600a54e8051c4a775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 17080 bytes

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