Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db389dbc4d93424…

MALICIOUS

PDF

75.9 KB Created: 2021-08-10 08:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3be07e073849567e3138f017cb6354dc SHA-1: 5c2ea169f9741e45a5d9e4666b99f9caf1037b29 SHA-256: 1db389dbc4d93424c9bc7382e1f0efc1c7fe230ee658350be21135db39cf91a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating an attempt to distribute malicious content or phishing lures. The presence of ClamAV and ML heuristics flagging it as malicious, along with multiple unknown reputation URLs, strongly suggests malicious intent. The file's structure and numerous links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c0bf3d229---begax.pdf In PDF document text
    • http://leton.pl/userfiles/file/39504566200.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa4fb3b800---3304972316.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72ec457d3---98120053146.pdfIn PDF document text
    • http://schubert-hh.de/image/file/fisinedexaz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072204220515.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/eokhn23s7s59kri42m9k61qcjq/74643978397.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/92303051300.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/15163186934.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/37e95a0e6baee26a54c11b0373d034e0/19006807176.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/gabofamabowuvomemakamep.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/37720947428.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/67241658328.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef59d6d56a---bovilafokofarofigat.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fa25b4076---puzezorinogutexoku.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fabetovefug.pdfIn PDF document text
    • http://kccmaul.com/files/files/xaragimosivemizone.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/46613782028.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2c61b7d3c23eb671ffd2c65b00beaba3/81117333561.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccce16c2d---35306100521.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ab2982ff9---43457317055.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7gkbvpm1hk19eljmjn0l7o16j1/pamezivog.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/86146616707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prentice+hall+conceptual+physics+workbook+answer+keyPDF 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_off0000c497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC497 11004 bytes
SHA-256: 84375692f9a7b0b47219d869442752156edef203571ab61b3a09c6f9b58b380c
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 16636 bytes
SHA-256: 6c682d2439bcfbee6f75d7b862daa62bd1f0bdb617edd95107adb5c6a56cebb0