Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f2c5e144e193f1…

MALICIOUS

PDF

74.2 KB Created: 2021-07-03 22:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbfe3e0e3169752e1f8c4c554f7a717a SHA-1: 225eb79b072997802538007fd2609e7847ce8c40 SHA-256: 88f2c5e144e193f1b19ac244e7fa402050f0d934b2dd5f3ce3bede32106b0bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to external websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://cecprint.com/images/file/47973421163.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5d0e9f277c3f379ee9cabb61e092ee11/zurazuzebuluworezigip.pdf
    • http://beloezoloto.ru/userfiles/file/xigitirabizutu.pdf
    • https://baigiangtoanhoc.com/upload/files/nofatedofenudasuj.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3tb8ant0hi65noep74bpqp2j36/rijaj.pdf
    • http://voijin.com/userfiles/files/50527270987.pdf
    • http://ingenermarket.ru/userfiles/fagidiruzidutedagonad.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/fb062d5ecc14c4d4d58b3cd841a82a75/8690064587.pdf
    • https://aquafilling.com/userfiles/file/62725694019.pdf
    • http://busankid.com/webfiles/board/file///jifilokakomamijafafe.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vjn50l781l14od622h14ukejs4/68675247554.pdf
    • https://egyiksem.hu/uploads/file/82892454533.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6e5baa2fc4d4d7879b5f02444f337782/22353013136.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/lemuvisezuxiz.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfd677fe8a---25053980520.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1853a230d6---17295962335.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c41c354a2e1---beked.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d932c2d8---webaxogakaze.pdf
    • http://booklandbooks.com/userfiles/file/rewuxagebetetepa.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a61b91a0490fd290da7fa86fd36cf9a/14095151923.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/pikufojuguwu.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1b496944574727aff361f28acf0215ba/badidevovonebulusinotelu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+convert+a+mail+into+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_off0000bdb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 16792 bytes
font_01_sfnt_off0000d5c7.bin
bc08c3cfae8e997e20fdc4f17514c284245301761cca44b4c95342ac40594bb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 10756 bytes
font_02_sfnt_off0000ee7a.bin
d2c853b4a07f0d31f7e5a29b9300a49c04faa65cd317f50aef62f9f61d631173
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 17368 bytes