Malicious PDF — malware analysis report

Static analysis result for SHA-256 c089a29c90e9ae8a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-29 04:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 097105b4697527a3dea4e8521b2ea9a0 SHA-1: 3480c8d68b2dbd4db9fe266579dfdc66f5064291 SHA-256: c089a29c90e9ae8a53f7a5b9f2fdea22511d707abf4d86da6ffbd49bda70c8a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign, potentially leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://queure.ru/uplcv?utm_term=impostare+launcher+predefinito+android PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a27bc938---nipazajewufukobusutadalo.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/15182466418.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/59628316669.pdfIn PDF document text
    • http://kechengchem.com/upload/files/44585554363.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614361624c049---fifexixozetitoga.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/27691061189.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdaf809a77---nesufozofidovin.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/mulun.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/26171474458.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090112544673499.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/segitigokupe.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupudufozu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6fbda3eb---74097170724.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/vozun.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/69968276699.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/gikakeruvokitav.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3q68d4e6mhj4i7bcv3d817o134/wanolofezuxilagusegado.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b73ff37bcc---nefepasokidiban.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/ruresofutalibixarebakatun.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/zevutu.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rasefirojow.pdfIn PDF document text
    • 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_off0000ba63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 10936 bytes
SHA-256: cc7e7d735b505768e6107b4b87e587e2a02957522aab8b0220e8d58d9e5e2870
font_02_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 18484 bytes
SHA-256: 55531d77ac3615dee04453a72a342edfd5727e8340504dafd08695fd94073799

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