Malicious PDF — malware analysis report

Static analysis result for SHA-256 936cc071fc0b9e31…

MALICIOUS

PDF

111.5 KB Created: 2021-06-29 00:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29dcee346c5630c076bfe4a37f5edd25 SHA-1: f8675e6523be3c3b892825018cbc358136e60392 SHA-256: 936cc071fc0b9e3152de4ccbc401f60e90ca7f5e6858721026646b28fd1c951d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85757e426---38057854889.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d99f2641826---61226165992.pdf
    • http://minipit.com/data/files/8658494006.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1avvf114f66vd6mofo6o47f1ts/77182784272.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c95049d34aafd697e7f61c594c5fe086/35993134906.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a25a89fbd8---ranogebedamigo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b195fbd99e---86254088728.pdf
    • http://moscowprice.com/content/xuploadimages/file/93909218669.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf741bb55---95336863971.pdf
    • https://alnahamgroup.com/userfiles/file/kudaxejipefolobasekefabuz.pdf
    • http://ithaca1961.com/clients/875375/File/zesufidebunuv.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af95f5ebeba---80907367087.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jdb32gfmdrtihvld1um48d1a6f/39345017564.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098768c314b7---14064999142.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721281364c5---posoxedixamafajir.pdf
    • https://seerupit.dk/assens/file/tilobujisowoditirosipid.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6596d74478308929ca7821e572db975f/vonakivuzodezel.pdf
    • http://ned.ru/uploads/files/29636378978.pdf
    • http://hoctienganh123.net/upload/files/53628744767.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba501b7e8a7---pufimifazerudamazevebawat.pdf
    • https://angkoronetour.com/userfiles/file/wubafu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c54cc7256---jozelumofozezixufajet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+the+meaning+of+notice+period
    • 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_off0000e55e.bin
ad9539f442a10cadcca87ede7a6bb879ccab06accc0bcbf316941dd6ada4f635
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 17068 bytes
font_01_sfnt_off000111bb.bin
6a547d742b26ce3d02f7f3a3037ae08637be4885a06edd7f4890e67b8fca88a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 41328 bytes
font_02_sfnt_off00017f84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F84 16792 bytes
font_03_sfnt_off0001979b.bin
8ec8e4e563d2ffafd52e1f1704ac45834c007bbfb6a37e6505fb03031bda2f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1979B 10844 bytes