Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90813bc8aa7032f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 10:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e293815621e6f0dfd50abe99081839f SHA-1: 3ce40ae8ce150c1042a3d768d1b00fd7dd9c5959 SHA-256: c90813bc8aa7032fc9315f4f73c9303b18f34307d55a78f040f07142205a0710
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting user trust through a seemingly legitimate document to lead them to compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3165c576e---reved.pdf In PDF document text
    • https://zabulgaria.org/userfiles/file/gepumu.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/62624747005.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16074f876b58f9---lupugatava.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cede20c38b0e5f27e2cf2ea318cbfffa/37804756533.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h7h06b2husdirlc778tj5jb1ri/zalivetubidagizukazag.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/mesowovenovijakobizojili.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/8510600698.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/6711832728.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76502566558.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/kamemadurikunativegu.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ea4145968c47790a7fcdf3b5db9c3aa2/pesidiw.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/35344331955.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/becc48ae882dae1745e12fbca06624e1/65492931409.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/96480486385.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/wixixoxaguxotumuja.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6illg4n3i1irkfl67n09sqhi27/nozugofodusovawir.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec523ebada---divubad.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f92c4f988a5---mesinov.pdfIn PDF document text
    • http://shahgrp.com/uploads/tikin.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0866d8b43---49313070607.pdfIn PDF document text
    • https://wrd13.com/force/file/63855955637.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d5c0e0d10fb63125791dbb071bc7ddab/zegesikunozaxinelijuma.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/81970249722.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc97b57c4d---98725417403.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4da00c1a---87264214899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=millennium+development+goals+%28mdgs%29+pdfPDF 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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 17600 bytes
SHA-256: 2da93eb837740fd9f7f795c38fbc01daef6b4e1a92905d0a6a2867c00df305c2
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 11056 bytes
SHA-256: fd5d322d42142c2d057ba3a67c48dab32356ce74317f46e084012a57afcb10ed

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