Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5228c2ef2834ee…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 22:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb1ef3048bd5b1971bbb6ac2cac3afb4 SHA-1: 153d487ad56f5966b22e4190ee8eda223b609331 SHA-256: 3e5228c2ef2834ee9e8cc9085c5c371cda46eeecc39b009d52a826bda668a34d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to obfuscate the final destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using compromised infrastructure for hosting malicious links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://massvt.sk/editor_uploads/system/files/92881740682.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/dagudarujurosorevaze.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/84433e767526546198ac901ec32c4cad/fadozatajemamekag.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/78818934891.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/10060cdc1e416b2a0a6c68d00083e1b8/fejirosiwexezagozinik.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/a44a2ec135cf0be07e0ada2d85f3bd0e/43593036555.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/vafekotawisi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c8f1292e---88514110435.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/88916683203.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be9058201---retuwesezamudolixu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/57874735237.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/73083351120.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jematudutulepapafaxosoma.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/pejubepivovuxureza.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/81570074757.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/20198777565.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wakomiritotojajude.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivom.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3533b4a9---nimemi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/kileriw.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/pizufimazawebelotebokafof.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/xoforinozonigane.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/wogofosibokivawodixirin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pulizia+manuale+iqos+2.4+plusPDF 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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 18896 bytes
SHA-256: 54f174e770494d96fb0a6ecf1b3ebc9cbcd183cb16b5847c641210c1b0686293
font_02_sfnt_off000133c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 10788 bytes
SHA-256: 75cc4e1f15052cbf2a9a6565a6cfcf7462cda8b8915aa35dc81602dddfe50301

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