Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3c0cd4f8ccc332…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 23:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bef90f42bf6d50552fe0addc380bab7 SHA-1: 1e7da2ce772b37e4354fa0eb60240ebd1ce4b8bc SHA-256: af3c0cd4f8ccc3322727d98f6e352f4ef4498e0da41e89da12930e852a2bd8cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests the PDF itself is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tutek.eu/userfiles/file/xazuxejofavatapu.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/28405828030.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gafivorab.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/23266455110.pdfIn PDF document text
    • http://esipro.be/userfiles/file/22137436164.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/95212075107.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/repoxedoxirowi.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/58852038544.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459cc3a1ed7---71207355477.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/63024052487.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/71364412535.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/7593818413.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/bukenixexano.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/mopozigaxugo.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/jujibib.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f1damis5cbpul193jv4votkm7e/faritazelugo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161484f4d0d3a1---kililafo.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/jawedoloderejegi.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/boxugowiduzofujabedoro.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/78025950652.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e19c0698e---30364003917.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c66659a188---26484402749.pdfIn PDF document text
    • http://chinahongji.com/d/files/76521380377.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/96010574857.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/jufuropi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8453afa0336ae6235b62c29599ad7bb9/73557812362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=osm+apk+modPDF link annotation
    • 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_off0000b6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BB 15172 bytes
SHA-256: 0c06ba0d139c73d81295cd7fa35d95a90db22afdef76e0c882044ea304b7c385
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 10100 bytes
SHA-256: bb6e3b049815eb95d744c648d1c466dba9cb5c4da9040b7ddba5dda758458cf1
font_02_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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