Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b302bc5661053a…

MALICIOUS

PDF

108.7 KB Created: 2021-07-22 04:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a80e987f09e0c9e87e1610a5fc7ee81 SHA-1: 892483a3613f3592e78dae96764a6d944837b128 SHA-256: f9b302bc5661053a9470fb55a64a4b9c45c57d19eb6cfa9e6d9858d8b8fd9cf6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/bf37bdb6102ff6b7b5e9d70eef839697/zujag.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f71c405b0206404bfbc11d9bcd0a7476/lulixerisixazukerazemazu.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ratajubimuxuwat.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3161a282---97268154358.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j30tn9acbcd9qutkkg3bh3bs05/zomilonesirem.pdf
    • http://www.abcklima.hu//data/editorfile/8275923947.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/davumupukip.pdf
    • http://allprintusa.com/admin/images/file/suwola.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c46858d93b7---wefew.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d686a95b0---91249961552.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606d532bbc27e---37599510485.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1a6fdfe29270b22b82ee1c45c5b73dc0/pigosu.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nazemixix.pdf
    • http://hurtmar.pl/Upload/file/tuxurubotirapi.pdf
    • http://urjabatteries.in/userfiles/file/kepegepem.pdf
    • http://canvangdientu.com/images/file/62475026108.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcefca028e---85474652585.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef214d313---zatomiweforijef.pdf
    • https://nguyenthelong.net/userfiles/files/kalejebinagepu.pdf
    • http://escqatar.com/uploads/userfiles/file/file/maloxumuluxunufenomowinig.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6531bd9860e282d99b418a5ec139f48d/wegirised.pdf
    • http://bigband-ulm.de/userfiles/files/mujirelikigetamavij.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e442267428e---vezefodewola.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6597020a76---94940113984.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+find+a+book+in+the+library+dewey+decimal+system
    • 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_off0001431a.bin
e3c3935bd28a54155fd09fd09d984687306ce4acfa70a91bf56eb0d5b715148d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1431A 17388 bytes
font_01_sfnt_off000170bc.bin
f33ee13d371b63f169eb8df4f9afebf6a7f94fc130fc0b46ada9f631b2f8cb3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x170BC 11164 bytes
font_02_sfnt_off00018aaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18AAA 16792 bytes