Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bd0dcd6bc8b483…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 09:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a062200f1e09b336ca7c861cf32ff00c SHA-1: fe16bb700caa2772756af8b94d10c471ba8ed77a SHA-256: d6bd0dcd6bc8b483766dd0f6a78352158ed636b90788e2f86c682974cc8dc9e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of embedded URLs strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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 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://whitesal.com/data/images/file/7565_20210905151601.pdf In PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mujulexugavixofodimuzuwex.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/pebida.pdfIn PDF document text
    • https://datenglagi.com/contents/files/zetubusevaduzutipofir.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/92398244819.pdfIn PDF document text
    • http://exima.kr/userData/board/file/vupudakimisemajewes.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/32036236373.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6edj4tlt3mis2tq980r7ko3snh/31366473025.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/vewemetedo.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909033401.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/vizagafepurajojariz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/mafabefekakumenoxesipotot.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/duzanitaxekunoseli.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/tetunanitob.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/90005408379.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sujivedepejuwo.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/tojuzopalujofutobasawadag.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9d067038---31299365329.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/55054153116.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/wukigidamifasanexokikak.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/rodonifi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/cn5m3g0s59jahlaetk95qv0ri1/73899222879.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/33190077885.pdfIn PDF document text
    • https://msvadba.ru/files/file/feparotetenabisojurozidi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aa138c41ed5c63af7eda653232d890a9/ropudetinejozarejot.pdfIn PDF document text
    • http://rinsacars.com/files/others/13603970018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ghd+tv+downloadingPDF 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10320 bytes
SHA-256: 8f7bdff427e0c96e9cbab2ce541dac5eaf8afd154a7da9a06391cff5248a8f24
font_02_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 18708 bytes
SHA-256: e35634292d7a7b1b65949b19b6b83fe1859f0ab1ef87d4984ba3d411e7c8e460