Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0cd26ac4a358af…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 12:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69fa993828563ab3abe22b6162fa3839 SHA-1: 05bb8e5cd3a8465640d663becb0f5a7aa7a9c35c SHA-256: 6d0cd26ac4a358af3f30e1ce649b3ea4a02af153246cc10f31dc55df09bd8bf9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=english+to+malayalam+dictionary+pdf+download PDF link annotation
    • http://poiskvod.ru/images/file/16965958618.pdfIn PDF document text
    • https://papiratisk.cz/soubory/53564864275.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/66221430183.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/74655559640.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af924d32125---87084382215.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6217da1abe0c949b1cbd4f29b7ca6edc/silesimokufa.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/41281578843.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/82114682748.pdfIn PDF document text
    • http://tfforming.ru/d/files/zedajononusej.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32d17208e---83205143020.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982ddb31bab---kurerafesufago.pdfIn PDF document text
    • http://kasargod.net/uploads/file/bawudanesokokimawudej.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bpd7s6uqfs985ban37djujr966/mupimexuxerevizaxalopasaj.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0b92869e80f81fb7a1231f02afaaf04d/jadivukaxugisa.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa10571f0a---68668212078.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bcff3287d---bovuxevovememe.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/pozodupiwilujuxus.pdfIn PDF document text
    • http://weymouthhighschool1960.com/clients/9/96/9679770cb43d952edac6f872f7aef95c/File/jenuviser.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/vutikesutulisupotetomufoj.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/83096651964.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f3d48134a---xujuwuruxujudipewum.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/bedajirozikulavixireku.pdfIn PDF document text
    • http://jfe.hk/userfiles/80311344016.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/nijotetudamipinuxoge.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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 11120 bytes
SHA-256: 92f9fa8f34ff276768429ad13fc0675e446acce7dfa07bcd52ef29ea25219cec
font_01_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 23808 bytes
SHA-256: eb5c3f621f12c09980a6974fb0c7d5313db5a65818c90c6182bc382d2f113468
font_02_sfnt_off00014873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1