Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68635a86fd48eae…

MALICIOUS

PDF

104.5 KB Created: 2021-07-02 12:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b0ec0152613e94c562299b68f7266fb SHA-1: 0e10f084bab5ab66e10efaee926974b885933d16 SHA-256: b68635a86fd48eaef6b73512813d22060c030f760c38da4619997e225b4dcadd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm on disposable hosting, likely to distribute malicious content or phish users. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common method for initiating malicious actions in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • 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.
  • 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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a01599144---donodegakodepagexizuvu.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bb12c27005569a511a8f55e97f1fef92/40457078745.pdf
    • http://amitadevnani.com/userfiles/file/22665638518.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ump6tourt22akntne2dfbn0mel/5526732907.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qcctspabrr8vc4gi0ed2tilki9/73627080869.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/428d02169f0bc348fb0f1d0643243824/77561050758.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429012240782664.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/kilejutaxor.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ecb1c239c---deguditexaripibuxe.pdf
    • http://duepassidalcentro.it/userfiles/files/toguvegirase.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e0956ae4---xanamuti.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/eju193jfiucrcib25ulkk2fvo4/91890039943.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/samumidaxipelaxab.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1fc7fe624af413d6eea864972e58aaa8/53496053472.pdf
    • https://maturana.cl/upload/file/xivabulozabawov.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160967c571df7f---polipopebe.pdf
    • http://albarossa.jp/js/upload/files/galizotopikifaligedala.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210623_999AF13A8A2DFCBD.pdf
    • https://batikatravels.com/userfiles/file/dibedokobagilezeje.pdf
    • http://bakoca.hu/files/file/80996737480.pdf
    • http://www.saito-ken.jp/userdata/file/rabupox.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c8edaaea8---vazuzevopusotamabudakavab.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2bb7aef5---sugutuduzufejo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/35507204584e51bebb52bffb10d3cdee/41207876579.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/r8pppcrn1350aqthbthvpbct60/85252381172.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c330d46ca---5397998548.pdf
    • https://sukhayurveda.in/userfiles/file/vanadivepus.pdf
    • https://baxsporthorses.com/userfiles/file/jodawubitamuvija.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=song+of+solomon+message+bible
    • 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_off00013517.bin
3231d49a29818477a8f2e9e4d57250f6822ad9209b3afb352609735bbbe64a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13517 10576 bytes
font_01_sfnt_off00014d33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D33 16792 bytes
font_02_sfnt_off00016545.bin
4e5b7bf4613015b6821d4c3da67aaa023e3d76c11b93c7807a969897a36b554e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16545 18108 bytes

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