Malicious PDF — malware analysis report

Static analysis result for SHA-256 90550b4823f14441…

MALICIOUS

PDF

87.7 KB Created: 2021-07-10 07:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7efa9628c5dfcd40a8878f93efc12bfd SHA-1: 44499da9d0bd0668a0ff8da57e925b53454bb760 SHA-256: 90550b4823f144413ccabd71434565d36839c3c7366d51688af18205c5468896
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://archism.ru/uplcv?utm_term=maths+formulas+for+class+7+pdf+download
    • http://rjt1.org/upload/files/760283609.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/909a4571882c1f5fc3b49102cafaf7bd/66954997732.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8a273d8dc4e5d90825c99ce6c82c8b25/xokanax.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089fe10e64dd---64411432772.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9j5sse267seoquk4r161sqt73i/moxubiteviwugukodapezogox.pdf
    • http://sgrappresentanze.eu/userfiles/files/20205658140.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/41a3af35e5d44db427c4cabfa153fe38/zoxatajutabefumeg.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6a5ddf9d2d2c5776503c55159c416113/mevegagebawebisowadopu.pdf
    • http://schs1968.com/clients/861610/File/98705374414.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021515038368593.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ac07f1a84---65581779883.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/33126787726.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160713d006f9ce---pakujiroluro.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/996pb331bk6gk32crffutmahj3/vinugidug.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b689dcbf05---77644622542.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/36be81f49287c00325d1b20567fe6f05/zogepukazozepalutenuzokux.pdf
    • http://pantipplaza.com/userfiles/file/maruzevomo.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/73288701306.pdf
    • http://krevue.cz/UserFiles/File/padimivekavuzulotof.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd1e13cf1---vowisik.pdf
    • https://contactfm.be/userfiles/files/gokup.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4d520945733eff59eed33049bc519bf2/59315644466.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210606141144.pdf
    • http://canvangdientu.com/images/file/2672361051.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad4b235dc---kufiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e757.bin
defca68572fe199b9ff48f05d9b57d61dc5fb1cd72e4d1f03e213a4e76f4022b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10888 bytes
font_01_sfnt_off0001007f.bin
ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 1780 bytes
font_02_sfnt_off000108de.bin
ac4045fc76d638cebb327e72a15aaf9ef39e9fb1ccc825627d082dbd34c9d3b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 17620 bytes
font_03_sfnt_off00013706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13706 16792 bytes