Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e258b366edc613…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 05:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a703b56ee74f416754f368b3e9113761 SHA-1: 1adcc1f34dac656c4c49f5d317e9f58bda339657 SHA-256: 95e258b366edc61345a25cfb8382bcad2a5e5ae343be854d8900b0ec8c17e4bb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites. The document body, though heavily obfuscated, appears to be a lure related to 'stadt zürich wohnungen pdf', suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cae7d0c116---35547432099.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f18434b3---56652079215.pdf
    • http://studiofantino.it/userfiles/files/73320707713.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/89945009720.pdf
    • http://www.annaleehuber.com/content_files/file/foxanebi.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608450e833d7c---55092704741.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3fadef8685ab9b317baa541f4a4e1d36/kajelagejosud.pdf
    • https://108pizza.pl/uploads/userfiles/files/baliranadodugetap.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14023faee---pofidakunokababa.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/74764063267.pdf
    • https://namratalakhotia.com/userfiles/files/wolavitutunibisap.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/takomedesi.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c92c856f38a---jinikekixogimituvokegeka.pdf
    • http://petrduchek.com/files/vagumevalakememozusonize.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jojelefepuvatokeloja.pdf
    • http://china-zzld.com/uploadfile/file///2021060220005989.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/biretifediratinuselerix.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/98182fc328fc30683d1b4d07cf0c7b93/musoni.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/60699068425.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/votiwimodafida.pdf
    • http://asckhn.com/acskhn/userfiles/file/93925313527.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac189a962f---xaripapojezagijagafaja.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/83653874199.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160957fab87f97---90736887580.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdacd32fa48---gabagofun.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce99a939d---91331141238.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stadt+z%C3%BCrich+wohnungen+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_off0000e58d.bin
ced27566848ad5a35fa551b8e9b9dafab39de2411c12f6a3d13cc5c902df06a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 21052 bytes
font_01_sfnt_off00011bc7.bin
863c4e13bede8e2e7a053be7a612c74e163ed444e6d202d7f046a90632e74107
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 11200 bytes
font_02_sfnt_off00013591.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13591 16792 bytes