Malicious PDF — malware analysis report

Static analysis result for SHA-256 0716f410738ade91…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 10:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 30580b8a55acfc980e75d13f2afc74eb SHA-1: ed86dbd7c65f7b9c2df25a0ab17de89bb4d0cae7 SHA-256: 0716f410738ade91743783e02d5e227816e2e2d0b43dfa03cf7cc49365f57391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://drafthe.ru/uplcv?utm_term=csr+racing+2+mega+mod+apk PDF link annotation
    • http://kvarkeno56.ru/userfiles/file/gogojufup.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/64177758200.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/dogetinomudezifugejoj.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/28824949043.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/61334372261.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/88811342717.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b77ac19b---42755432077.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/migisawisusepixobure.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/38087442469.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/80054661681.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tapiwawerip.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/lepasijonubosuzerata.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dawuge.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/6460186673.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/71413221752.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/14026cff19785e65bc21cbb913b08af6/sinapafox.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/15787475453.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/35339502824.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/jififurule.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/vusare.pdfIn PDF document text
    • http://alptw.com/images/files/gaxux.pdfIn PDF document text
    • https://braus.uz/images/shared/file/liveburidovujedojebiv.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/64581942557.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8c6783be---winiguwogano.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/93625232874.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/1281253193.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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 10956 bytes
SHA-256: ed5f149efe68ffd3a855c8fe376b78c4205a2f5a444edec5b684710cf22227e7
font_02_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 19456 bytes
SHA-256: 94a59501cc5219650fa10c88018b627bf52245752d1c9fe4cfa1050e365d3c6d

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