Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f9a793733c9b6b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 18:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af047b82386795a296f703aea6c1a797 SHA-1: 2b3f9c35537b14564858b719c89389bb4f95c8ee SHA-256: f3f9a793733c9b6b95a2b871d899851de1b0a3fddf856bb44aa1003402d8fc90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=marvel+contest+of+champions+mod+menu PDF link annotation
    • http://thaoduocvn.com/userfiles/image/file/tinasaduba.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/29583881167.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/90751337045.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ab82a410ec825f232376819e384cf86b/jumobezijomewavobopol.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/64929699678.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/50585143612.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/39088223307.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/75364723425.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140d8eb22fd3---14567506503.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/om729dv0eenj4tkr0ht4j33cog/13378586613.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/tavujavukalowigijite.pdfIn PDF document text
    • http://reopen911.info/media/file/85144212177.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/66016043977.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/tegamixigusol.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03dcba703---60493300024.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/80584242433.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/panobemixekarekujuso.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/lugikujalunab.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/19400508864.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916091639.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/wijonovujigadixoj.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/gutarume.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210902_4E584E60A5E652F3.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nubibogotup.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/fazumapusulu.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_off0000c41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41D 16972 bytes
SHA-256: 46761765266cb00201e94c81839b42b05e3d7191f0ca6fa90641bc9150f2b3fc
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 11044 bytes
SHA-256: 6e9a86c2cc326e3ca85e471972ba0abb6276c31f8286edd645d45b5b4845a454
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1