Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb94fdac9bd32ae3…

MALICIOUS

PDF

78.9 KB Created: 2021-06-21 15:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e07d5085b65821909ba0c6673700079 SHA-1: abf9526a6da09af43588e0cc76be561c4ec5369b SHA-256: fb94fdac9bd32ae3a7371f48bd34413dc19f3ad7169621cf1c8030b6c4a5e1cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=thomas+and+kilmann+conflict+model
    • http://k-yoga.org/file_upload/spaw_upload/file/20210509145349.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/69ehfkl46c66e71f3hmj44hb24/wutumujixik.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d68f236ae922dcf95c728a2967edef67/79684331253.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14769aaf4---25451765818.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c9467b5de---mubejoxux.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gr1jkugh75o0avcamgfona4ne5/napejaki.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/3ip8u2bof0n1avpdioakcc76o3/81060611108.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c1b45fb019ff09685330df4c85d6f61f/kilewufovu.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/954cc3ff361102d5ffb022e986af1862/doren.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/81v62ollnekhkd97g8hobes3hc/runubivubamapaludozakurom.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160818d6f9e0ec---11213200759.pdf
    • http://ecohort.com/userfiles/files/benemozibatezan.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0d32bcb79---sowosapadovurirusave.pdf
    • http://benevolo.it/userfiles/files/rupulinipanut.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877e7e8ec95---73755898152.pdf
    • http://alexhofford.com/temp/files/file/wovutokesilewolawav.pdf
    • https://cmsschoolkg.org/userfiles/file/13158283214.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba0.bin
e033571368c4c9d17277248ab832f5a40292904a374721493ac44b9df938e0d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 4964 bytes
font_01_sfnt_off0000fc53.bin
df3609aabebaa8710ff84f7a6172e435a2f12cc644b71a4a8ea0efbbdaf90a45
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 10824 bytes
font_02_sfnt_off00012068.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 4324 bytes