Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaf70c5fa381b41…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 13:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4f99410c3a4301d83f58359e64b9824 SHA-1: fdf1d90af5e7709b9e6eb391799d0690f5d8cbbe SHA-256: fdaf70c5fa381b41e6096522c230eb178a3ab36c78d46d955cbe1ad9eccb5f0c
196 Risk Score

Malware Insights

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

This PDF document contains a high number of embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 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 https://irlanc.ru/uplcv?utm_term=do+i+need+a+sd+card+for+my+phone PDF link annotation
    • http://tongshengchem.com/ckfinder/userfiles/files/gowukegafonezoweg.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/85863373905.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fujowokadinizadejuli.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/5833142971.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/vomiwirukifopud.pdfIn PDF document text
    • https://ysh.my/userfiles/file/71571968103.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/78292796306.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/87097187311.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109040842426285.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tojetinefiliwisaxowov.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/60205037047.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/12700754738.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/80714294356.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/63963087399.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/8718440988.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/xareboxikuxixevod.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ad8f8fff2d6282f76ec8a1da4dbfd5f6/rifabuwozofebuxogemaf.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/14494690333.pdfIn PDF document text
    • https://trexanh.net/upload/files/ponijoba.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613986282be48---63624062602.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/83597303329.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/2824315922.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/gadiw.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/koqjrj31k5b0d9fhnmapa564l4/fiduraxurixepun.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/28280014244.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/051416559048.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10856 bytes
SHA-256: 8ce02a362a9541c4fffd4e75948133c7c01604a4cf4c896d8d8d1bf89e190bff
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 17600 bytes
SHA-256: f25ba60f5827294a6a4cac17474ef051d987e303018c6e7ea83d2ce1cac9625e

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