Malicious PDF — malware analysis report

Static analysis result for SHA-256 36901f848cc8cabc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 12:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62f103038bb26834386de5a25f7de63f SHA-1: 5980aed00be173ae940267abf2aa33c2349edee5 SHA-256: 36901f848cc8cabccebb424e624bb8780eb1f6f5cab827e189f0d900ca0c12b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host links for malicious purposes, such as phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=macap+xtreme+grinder+manual PDF link annotation
    • http://tolltisztitas.eu/userfiles/files/lemajizavazepofuxu.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/xepumololasalokoguf.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/jasagulinibugif.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/legodunosubolaliberatoj.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/a8ffc6eed77dc87097edace829ae78a4/36846890653.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/1hb82p2lso8g4a1do9a4l1g2ip/satifasoso.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/61339097775.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29bb9544b0---pisaw.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/54127474926.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/30915503651.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f06c9e95bbab5d8847cf54daa263a475/nokoxapak.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b0c2d08412854d4e2f23e4443a79861/66403036300.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/19835153986.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zujivumozarajavefewuf.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/93275978057.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8deb123ce3---vujetojatipedizo.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/78318448693.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/xoruvufenulex.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/70945207465.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/malapekuxefov.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/48061049384.pdfIn PDF document text
    • https://12shio3.com/contents/files/3861800647.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pererer.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_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 10764 bytes
SHA-256: 836e4664d40d6ee3b15dc3be1b0e9838b173f0f40b64bbb0d5ff630d1f348381
font_01_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 17364 bytes
SHA-256: 6541fb6ad7b7ab321ff534609f9a6d7dacb023a6dbc9f4e3c0f700022ce3730f
font_02_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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