Malicious PDF — malware analysis report

Static analysis result for SHA-256 465f12d1f20d6e00…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 21:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1147079e72b1f52b01a2c3546b9496e0 SHA-1: f570d471978167b69b11133c565f8db4d967993e SHA-256: 465f12d1f20d6e0017840fe7879bc52366749498c0307b2c5ea08cc1a807134e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=action+research+in+mathematics+problem+solving+pdf PDF link annotation
    • https://diphong.com/uploads/33590852980.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bakibakubu.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/gorivikagilifutiletu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b02cf76af77---90865133168.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/159bfd2122a05ebb5c1b923a0af26c93/14301499992.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db45c1e69---20660797852.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/93051477412.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/93925100465.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf30868d46---xadelosozezagugepe.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wovow.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/gg40mrc4cif9nmll98pgjt7aq2/13876845743.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/00745f37651867128649c002aea7635e/86026207897.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/16c2b3884feff4acf446b2b98860ac8b/907738020.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608df927bc6df---83740176896.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/54589765044.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/36dql9i1atllqqg1on7ht51e2e/tilupebo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee32f079ffc---21771663776.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bad5c4def4221bda723a9071ab3d7dfd/lelezujuzan.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/87579808608.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621102787.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_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 18400 bytes
SHA-256: 19d557b00868a20b0114d84dfd9cc7a9117610d8a6252bfe321f950574b9c252
font_01_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 11252 bytes
SHA-256: 197cb4d5d1b960a681fe9c2fdbc6e4cf520eb7978c1c2691880b84edaad8ef2e

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