Malicious PDF — malware analysis report

Static analysis result for SHA-256 a332152727b17992…

MALICIOUS

PDF

83.0 KB Created: 2021-07-16 05:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 083846bc035c7b163b03a0ddc0675034 SHA-1: 4c7b9704e4905f339701751a6bf890811bb1601e SHA-256: a332152727b17992c6a02c8d4d36435fb001afcdec9174c65d2f9e057a111cc0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and the overall structure point towards an attempt to redirect users to malicious content.

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 https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/b3stgk6e4pquunhajsm9jk34u3/15929287243.pdf In PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/11738725292.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/zukinu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/91634088054.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba919a964f5---11573282099.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd3748178---kozawaminofugib.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wizegovodoxazabozel.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/i6hu75u1lkf99483mpohf2ot52/siwunajov.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/xaravelazuzizoxubidu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e903b4d8---sebenalukinovokurujafi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/migoma.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075f23c8859d---37902866604.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0664eca5f---40262774296.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/59716292822.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7d71678b---23410578628.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/35461925432.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7hp9en37oh6lar4lsjg0uh6ssg/vuwidekutumunobidilonog.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/44q2m6l4bm9retirhq78arp9t3/fifedikigi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a84446a9c2e---gifasewerumi.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/62591033194.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/xamopigugo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca38a11aa2b---xobotezomuxes.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/46572959616.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80c250cef0---mepapamebe.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745070b43f8---xizebemafewiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded00d0a47---wifekuxatadef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fall+guys+cracked+free+downloadPDF 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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 16896 bytes
SHA-256: 925e042eef8d0315a0734485d9a93da1b7d80ff96d6b43535c7bb2133f1499c5
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10832 bytes
SHA-256: 82001e4a1f66147cf5d347ca37a8f2d5fc17fe3dbb79a03c4f4fe3f1623a0852
font_02_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1