Malicious PDF — malware analysis report

Static analysis result for SHA-256 76730897ee43b273…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 04:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f4f0da447bd21b282a67e30d6869cd2 SHA-1: 50f960d4af1152c604430228d54041b3fb5388e1 SHA-256: 76730897ee43b2739cf7388d763066f5ca7167817fb2052515883d449c5ce433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to lure users to potentially harmful sites.

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 https://infrive.ru/uplcv?utm_term=complete+surah+yasin+with+urdu+translation+pdf+download PDF link annotation
    • http://keyflounge.nl/userfiles/file/nasutazamilurixak.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/nazopiboxipapoposibobu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161139be2451c5---23634399496.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5f5f6c851d6e2be07b9b10f209efda6b/5205126617.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447054d3dd---43533505785.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817a67d18be---4050295125.pdfIn PDF document text
    • http://gibisch.info/files/files/vokivevedobawavenas.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102a2016e486---27389774936.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/fidodopukolumexilol.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/godosikifajozopuliv.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/gidedufivimiwafonavu.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/pekagarogin.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/oec6drd9culom15in05qei1jts/37394714838.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kemamadataj.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/26050919276.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/bijewuzumesajuvezojejip.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0bfc1a6e---81219200851.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104da788c35a---85765434972.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/radanevilatufomirufiv.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/kabir.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/40394672872.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f15ede269---24931564332.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b32db06e4---gujikaxujogubigudi.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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 11096 bytes
SHA-256: cb5a989322d4dd2c2a31043621a88acf9cae0ed91e75bce0b779186a0a8b9b27
font_02_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 16436 bytes
SHA-256: 79c9046a235e8767db5441d55b6554e15e527113270b1d25dab0f5788324eed2

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