Malicious PDF — malware analysis report

Static analysis result for SHA-256 a347b6ce3d89153b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 17:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 128cc08eb12b788d2c943ab20b3b5d9b SHA-1: 3f65028c3f2afa7c82e146303ec37a1bbe28136c SHA-256: a347b6ce3d89153b65bc4952e72bd5f3f943be1c436f3a0acd5ca12e6e27d2ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=world+truck+driving+simulator+latest+version PDF link annotation
    • http://aptekarynek.pl/zdjecia/fck/file/87600029759.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c55c909067150e2946c015a75cfc0be4/vajarasajarifaxed.pdfIn PDF document text
    • https://duel.pl/userfiles/file/36558871607.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/rimafazuvezogiwuzikatan.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/wezimobemubuvorafobifer.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/rapiwalekupadaruginofot.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a613e73df---97777058625.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/1141997582.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/gojefikitom.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/39951838304.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345cdff0a1e---kumododefak.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/90969266105.pdfIn PDF document text
    • http://devveb.net/userfiles/file/918773687.pdfIn PDF document text
    • http://3asoft.vn/img/files/42169349386.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ecb8140d18ae35527e12da186c366bd3/30902106766.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/99742701890.pdfIn PDF document text
    • http://eko-uklid.com/files/file/51709565331.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fodetaw.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d739c9a2d02bcad7554c4fc02909bc24/golababudemexumeleserewu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/82590150899.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/36727906491.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/60674809438.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/71735268885.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/pejuxiwaj.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_off0000c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C7 18664 bytes
SHA-256: e9b2059aca8c0adec15ae2810ea79f39eb3712f102eae528bb903e5add5cb459
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10964 bytes
SHA-256: 52e5df16b0cef5786056d8c555e763f8707c96d0421cc4d19111e631f69e783b
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1