Malicious PDF — malware analysis report

Static analysis result for SHA-256 1134e9f125b1e084…

MALICIOUS

PDF

99.6 KB Created: 2021-08-14 19:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffb0362a15b1e7a556a3c239e9886afb SHA-1: 46c6bee9bcd03ac4a1643774fc912aa1c9b7e61b SHA-256: 1134e9f125b1e08456c88ccee3fd42837990f6fd5c171ed9b7f52264c7e50197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=split+back+offense+playbook+pdf PDF link annotation
    • https://sahyadrisevasanstha.in/userfiles/file/rodapumevikifugon.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/maxaxokigu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/131058141241.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/54692530055.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b1acf914665e717f2908e048f67d9e6/75880014567.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/vumenomitupitilikofape.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be1f9876a---topev.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/mevopa.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/48405168248.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/mogovepokozanurez.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/46253026463.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hmvs2jpn1b5ema4pa4ib15o5p8/40851079060.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3e90ef55757e0198336228910eb8b925/49162019509.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/butedalozabewipuxodef.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/48166358941.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fc0eb76d5a3112748de52f56a2de374a/23609092566.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ef194d5699b762443a3d5d7e4712657c/tesamoruxevizexakadusof.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/nu48rmtuc1env35ver7dpvnr97/34232108333.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ded0337479---34224555503.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c937d433---tidolafunowizuberepukutu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fotolojedotex.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/27c2c96bac32f8b2adfd3a4581353126/56120832920.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff439f611---20374175133.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/sunipesomu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ksk4s9v4q8r88pdmqjpkfjbp48/64083246757.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_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 18036 bytes
SHA-256: 70e2dee77f32c63ca07ce1c989425c287f15deb7c6711ec86c6393c361c356fd
font_01_sfnt_off00014f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16739 10936 bytes
SHA-256: 94effeeac388bc4d5f446bb26c95e54a6bd3b1598c23aca32f3f2c1f21f377f5