Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57d798207f6fb0a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 22:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24cb10a2c1e46e14f6793f2c408dffce SHA-1: 62eea8bcdc91fce88ffc8db842a943c6c40e1ea7 SHA-256: a57d798207f6fb0a339f3fd31bbd8b3edc9900be8dae1af554bc80ec04735b63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or further malware delivery, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/997d8758dc2f3b4c444940de569a262d/80400732650.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8b47b38c841d3b7d25ef86ff426dec46/39008274057.pdf
    • http://hrdiborice.cz/erucom1/files/files/sobufov.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/xulalikudumetegejofiw.pdf
    • http://chnli.tw/CKEdit/upload/files/39159610421.pdf
    • http://bioident.pl/photos_fck/file/64044925825.pdf
    • http://quangcaosms.org/media/ftp/file/tezegovukozu.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/e5lulu76ga5seq85oihh0hgu0c/96667158039.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c24e21a5c2a---8949858689.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f21d2c4fc481d7a980e581477264c61e/99509986114.pdf
    • https://mariellatriolo.it/public/file/fenosaso.pdf
    • http://www.lugashotel.com/data/editorfile/vuleduvo.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/691566005.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/dezemudupudanezo.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/122a656740ebeb5e3396c4d934c1f4b1/tubitesaruz.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/61334236192.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7cd82eb4417907c90c073d207106b9a3/83901905205.pdf
    • http://195exim.com/datas/files/xukafofabagizoditar.pdf
    • https://lapalettedesarts.fr/gestion/file/tanaz.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4sb68dravanmsobfbaq29vguot/7787613671.pdf
    • http://pantryscan.com/123cars/imagefck/file/3273143775.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c67696a4---fejapifaliku.pdf
    • http://all-pass.com/folder/editor/file/vejotisebovotuz.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16094b398c9a49---71282405270.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pwd+question+paper+for+civil+engineering+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f044.bin
943c72922db342a460cc3e5a2e271bdd7a7faa0c2712ad27f5a90f3c45ee5343
pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 17528 bytes
font_01_sfnt_off00011e72.bin
56a28fd572ebfb0e6fb529229dabe70045a771c8ba68d3d260a47c0fdb7e173c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 11192 bytes
font_02_sfnt_off0001385c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 16792 bytes