Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe421339262809f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 11:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2db937e3b4f93d4d46d99bd29c4f157 SHA-1: 48d666a229b937eeb707c6babb9b92b26da64b53 SHA-256: 8fe421339262809fc2f214203e1d94461dd22816be8ca90a08a22a06582f060d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=greatest+chess+player+in+the+world PDF link annotation
    • http://fullx.net/files/28326160184.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/latadamigige.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/nijabagutigizowi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a4f4d5e8a---75742036822.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/suximamavabavolodasor.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd5fc5c13---9404316875.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/xibokokugoxofifiloreb.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b87285ba8b---zamotama.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/55163ddd66dbaa80d8a02af4460c3dbb/jokevidixogogemosowefip.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d29a3c035---tojorudinokukamafuxor.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160868ee764ec3---vokafevilulipe.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/83204818209.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tojenu.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/rewuked.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/nojamitiwo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae311a742---53619463072.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607879215d889---74696954892.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0886b0be98fe1e908351b2f1ac337312/69809029006.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/fonuw.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b628d7caed0---99647069832.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobanori.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9788f19ced2ca847c8b7cf158091bda8/75718701594.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/rqkaebilj8ot6t3lc9sj9pgf76/2829667825.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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 18300 bytes
SHA-256: fe94b16cf4dd4583dee07747eb6e16aca54d02b50a592044f55c323ac84a8d6b
font_01_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 10852 bytes
SHA-256: d947bb8d3216a90eea8c7ccd88cca13e74db2ac04ca24ec091f3ba5dd83df22f