Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db86a2e08c46c18…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 09:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 055c2998f39eb189288340e4c09b030c SHA-1: d60030cbec01308b302ae59eec2b2d6b9c021d37 SHA-256: 2db86a2e08c46c18032119b15c6b156fd109d0379577de4178af01d7ae5cd9f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. These links likely serve as lures to phishing sites or malware distribution points. The PDF itself does not contain readable content, suggesting its primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618fcc0a53---simomow.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/328b110006acdf289598e7f77024cf4c/vokuxej.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v7v7gt9mp5t3cvbeo1k1hd5spp/juxaxibiwowurelukeder.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/52038880139.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/c0eqmnqong92fah8slh5bjqiq7/gerum.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/30f9b8af83a82c7e57899f724c61f132/turutinimejedeforirobobus.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/melumukijalimew.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dce5a86bfadaf9cbfc0578c7d27a2df5/52293427616.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a929be746dd8c289e956b1e7e1138076/ronekidufarujafotap.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43eca028f---simunut.pdfPDF link annotation
    • https://study-abroad-travel.com/ckfinder/userfiles/file/vuwuvewexiviwirunelifaxuf.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/94140713820.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/tonuvex.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/17hg1eqq0jaik3se0jms5g7r5l/78891057984.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/18kchlrt2t57mag0rrgor6roic/54505577757.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e04241582---47525708714.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zarofunimakesopekaraka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a9e5c362---93777361620.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/tilegemevorigenisatabaga.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2ce6551630ea5da2f593701a880b86ce/3691631333.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/rafot.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/obupefedo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db465a7a110---riwegetosafuligerolale.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e0571d5d10aca7d00cbb29adb4c920a4/904354727.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/tifugapiretarewudosajos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=birthday+wishes+for+old+friend+malePDF 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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 17396 bytes
SHA-256: 1d03553d41c73b96f70c08aeecdbd6957c33ccf55657ef55092445159979af0d
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 10872 bytes
SHA-256: 9d149ea4eb5d2477d375f990a52438f1578dbf3a8b20eefc6df7d95490babb98
font_02_sfnt_off00013a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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