Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd1de9081066fe…

MALICIOUS

PDF

124.7 KB Created: 2021-06-26 06:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5846bdf802f484e0994f3dc45d330f50 SHA-1: 15ff292583f8d7e3939a8935315e7d76bbb72098 SHA-256: b3bd1de9081066fe981c8698703395dc0bbea17241e739ede4897de25022c515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves exploiting users through these compromised sites, likely for phishing or to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65c4e4a06f---bupetofetovobesaja.pdf
    • http://geologocarmignani.com/userfiles/files/selezox.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2dfbd37e24d6909bb0849cc9686d0897/levixowimajipejigobuwalox.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607196329c55a---65040369357.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7006r2mi13fk1hhlefib1v2djt/26795580987.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/nl4lrnf0thkfv46r4d9lqnsv47/worojejel.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1debab91f---1527361239.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d04fa57bfa6d7fb65627630a303f25c1/93597589094.pdf
    • https://avvocatoboretti.it/file/tafigufasi.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a859ffa7b40---73808302442.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f9f3fa38dc3a99cf4dc83b5f74f41e15/rakuwe.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c218928aa36be708ea124b11863909e6/73756712185.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbc385c16---nenajenetolesad.pdf
    • http://colescastle.com/clients/875019/File/8541927221.pdf
    • https://detectiveoffice.net/userfiles/file/lugufitajoxubeladukidavi.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/46544335753.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a189pi65ll74llbonmordfjpb9/21842491800.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e6df330680f8e0db10876057585fb402/kobijenofobelused.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6ced2e91183a7947d869cbbdefb692a0/34262241648.pdf
    • http://soupworld.de/upload/file/40451454632.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e07e7a05---49541629392.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4e57cc0---77950000642.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f0e7416b4e8743de8f53308636bb3a6e/13433938826.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609b958268cdb---6577740637.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=han+solo+naked
    • 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_off00018371.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18371 16792 bytes
font_01_sfnt_off00019b83.bin
3dfc4b8bed3572eea75d4ab4c2e632692dce54191303de5885969614b4245bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B83 19452 bytes
font_02_sfnt_off0001cda4.bin
460ccbc0f7ca38c54b79e2d1f525faeb9795ab36cf36b9d7fcaaa53eb7699fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDA4 10032 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.