Malicious PDF — malware analysis report

Static analysis result for SHA-256 226b35e824a5447e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 11:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e27f6c49540e32cd6d7c6384a92639f5 SHA-1: 103da8162da0bcc1b784b93e6229a5a3a28cf775 SHA-256: 226b35e824a5447ecb313a655d9081bbe408b1d87ade183c8ddd2f59cd86d5ba
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm designed to lead users to malicious content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aokman-drive.com/d/files/reregaw.pdf In PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/23613094901.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607509447adc0---11791243879.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/mebefakala.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/92466f3b015f74cd321b429315b7902c/mezosenufiwokixule.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wezagewojuwomuxa.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd1146da4a46a6e2d9f4b5dfc7cf79da/7877359879.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/10880090043.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pesili.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/61710291480.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b80df1589ba73c9833fc60423a393073/89715061720.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4811c9d369d891b9c8b9ce762e5c6f7e/napivef.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/dbf88a8eeec4e0fde81396f36defcc3e/filazixafomowoverenufo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a6857e81---nolonuzupikofuvebapi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/zowigonu.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/katotufugiwoko.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/tetajejanov.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60e5e958e---pelunaximokugixatoxudaxel.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/81675957203.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38d8t0g4ugg2o2tfbotapc6267/71603610375.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5a3071525---garijowebomarobegegivogad.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/1762025979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=skf+y-lager+katalog+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_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 20180 bytes
SHA-256: 3e723a82bf41065099a18c76f2389c0eabcc188b9c046e659825a2fc1c01daf2
font_01_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 10624 bytes
SHA-256: 6a8df6765055cf7507194185fa4a51310155059263d8a0835d0442a8ff53a425
font_02_sfnt_off00013244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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