Malicious PDF — malware analysis report

Static analysis result for SHA-256 36305496b966e7c5…

MALICIOUS

PDF

94.3 KB Created: 2021-07-03 14:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3035596b628002d20385d185e09e1bd4 SHA-1: 89817f4c12dff3729a063eea1e06a76a218dc2e5 SHA-256: 36305496b966e7c530b2349a146ead2bd962e8e1628ed73a2983b52515daa896
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as a link farm to redirect users to malicious content, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711635545a3---93121856305.pdf
    • http://kaies.cn/upfiles/21062709284373816720xdx9.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078902de759f---mowobosotovekajuju.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9868fc0a---72163959759.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/mibivomozig.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f01dceab0---bobakezivigejen.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be9802466b6---voxenijino.pdf
    • https://batikatravels.com/userfiles/file/zuxidikiritesogufudun.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1ec8cffc4c8c59196dd74b4a052328ae/49179690577.pdf
    • http://zhouzhuank.com/v15/Upload/file/2021619828131969.pdf
    • https://arab-hams.com/Ups/files/89881458209.pdf
    • http://abimobiliare.pl/pliki/File/34397203369.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c0d77ce2fdaef1db55d7e7ed8dc237c7/1253407868.pdf
    • https://anmoul.com/userfiles/file/xolamivugiwo.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5cc0f2ba0b088aa2ba05f2eb737e0080/89903001984.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4f72imv95octvg9bgu7h2obh5t/fitemusu.pdf
    • http://netpost.vn/upload/userfiles/files/3786040564.pdf
    • http://schokobrunnen.com/idata/jonemiwudufesovusok.pdf
    • http://studiopol.com/userfiles/files/jikafijamojufukurebep.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160912c794fba9---ravojadowifufi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7krps982h77sc4qtn0e966ua7/rifunidoxijikija.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a720d4c3---senubemobagizetunoveri.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba32c12901---kidesebajame.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f3e8b132---nomupipe.pdf
    • http://bitite.lv/media/txt/122/file/74068103914.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+hidden+pool+pdf+free+download
    • 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_off00010e15.bin
024f65ecaa8b5fed05069c8853336eba36c197a0bd1e6517520ba522281b9720
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 17484 bytes
font_01_sfnt_off00013c4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4C 16792 bytes
font_02_sfnt_off00015463.bin
cadba937fc28a1d922610aeaa89079f1070c1ae4e96c4ee7960043b2ca2b1ead
pdf-font-stream PDF embedded font (sfnt) at offset 0x15463 10376 bytes