Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58242a9d3efbb87…

MALICIOUS

PDF

101.6 KB Created: 2021-07-01 09:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56784cea27ff7acf6e8773ddeb768904 SHA-1: e107d1c6e42032b0c98fdc82f914f410a297c99e SHA-256: c58242a9d3efbb87b998137c296f228efd129bc789e67e0b3802a970c462efe8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the nature of the link farm and the detection indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3548391af1e788faa8074f538fa40dad/gabezufo.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5e7e5a5beb5a4ff77a3842b7ee6c21c1/kukubinurib.pdf
    • http://casaatlantida.com/userfiles/file///zepuzejefunebegapemako.pdf
    • http://beergolfers.com/blog/images/file/82961948659.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d4688d35---bapewimubupuwuv.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sugoxotefiborelajipulenuv.pdf
    • http://anthonyvienna.com/sites/default/files/file/vimevene.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10ccac7c9---38223738765.pdf
    • http://ozari-ua.com/files/file/65174526190.pdf
    • http://strategie-online.net/catalogue_dynamique/file/tafanaxobajejuwolig.pdf
    • http://project-st.ru/userfiles/file/86604253861.pdf
    • https://cargobull.cz/res/file/xewemokip.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a04a14aa2---69219064614.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/rokeg.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tocpqmk8dhpq3a83sdh6ap19dn/puxajodoru.pdf
    • http://shinies.ru/img/lib/file/bogibowuwaduzijuxofup.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5c11e8d897396135de6f562738093106/55048903564.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc83b64ded---29884041797.pdf
    • http://wagnerpc.com/userfiles/files/36835197853.pdf
    • http://csc-0411.com/userfiles/file/20210625051702_fn4h55.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3800ead7---50093716709.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/9bnr3ntbeo68bprlamkhtr2krl/zimezenasonimolo.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e0e4ebc933cbe1f4bd4a4f733d769b45/10837742518.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/45153e5ca9deaf35397799409f6f6e9c/bisesasasusigewalugoxu.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2828ce83c8b374e623c0b232bf589fb2/83531779015.pdf
    • https://bbgpiti.com/userfiles/files/mibugojejatugoje.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2fbe9e868---fufotawivubezejosasivufe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+study+of+earth+is+called+geography
    • 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_off00011414.bin
a3d73c18c4b1a1a726ea59d50840fb894877bbed0aa8bc179ead24c844fe26d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 10972 bytes
font_01_sfnt_off00012d81.bin
e7a37577ba2a30d0a21bb681a7b7576409f500daf7f552f2d697e0621792291c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16400 bytes
font_02_sfnt_off00014408.bin
cc0f8537b3fe9af5fa165f5dd18610c09237262eb341ea9423cecd2202e433ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x14408 16948 bytes
font_03_sfnt_off0001703d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1703D 16792 bytes