Malicious PDF — malware analysis report

Static analysis result for SHA-256 db727c22d60f4a60…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 22:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce3aaa84855a884376aeb3563d475c5a SHA-1: 8c497306fc1f28f681cafcd33ad1c5b9e3921fa2 SHA-256: db727c22d60f4a6073670780d89d423bc34b629ceaff243717cdd578760cb45b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to appear legitimate by linking to many external resources, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms the use of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=dicionario+bilingue+espanhol+portugues+pdf PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/om53ovi3gff5ga1qsvf5rr3htr/retovogasizofi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/blplu2egm34nk6l5hqetrm3eg4/jepomapam.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dd47f3ed---jedifidafupiwenupipojevad.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/49646373546.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/dobazapolejudubixuri.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c761299962---73966232461.pdfIn PDF document text
    • https://schmitz.cz/res/file/48743588806.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612392436014d---46984598298.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160790a2758c3e---laxenipomutidujope.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/towobiwojujojab.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10f305ec3ba8c01e63b83aff910239a3/romiritexezudoze.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078755eb554f---92752546382.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/fowasuruxusowi.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/79138213214.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/29b3261474e212f7df711e4b745e8028/sututogugopesapowudok.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8473065676.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/65409501577.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/j0g49bs1r89jmfb58nhhke6i04/26616997411.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/wujevitubatu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086047331c24---goveta.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/89624012714.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 11140 bytes
SHA-256: 30e495cccc4f5c8c2e36c8549dc920ee37da0a7c625a08119d964412fc1fb803
font_01_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 18636 bytes
SHA-256: e99c8077e214da922a5dfa3173005e4df47fb6b5e15ef159a7af993e23492edb
font_02_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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