Malicious PDF — malware analysis report

Static analysis result for SHA-256 9690316803d1477a…

MALICIOUS

PDF

79.9 KB Created: 2021-08-25 20:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aae0302c1f32a1c02e33ea08aaa6ee67 SHA-1: 782572f334663c5d08ddefb9b89769068d4afaad SHA-256: 9690316803d1477a5bd8c393642ba13afd7fc41481a95031982c084307455ac5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://immobilieninvestors.org/userfiles/file/88450178731.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55504852844.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80d4c950f---51658393383.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/26321480123.pdfIn PDF document text
    • http://hainfelderteich.at/sufav.pdfIn PDF document text
    • https://bdata.vn/upload/files/gobutijapepavegetugus.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b814ace3f0---kadolowuvevoruravogi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-28/20210428232236669753.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/29466288359.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085202417125---2933811901.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/senefinuxevuto.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p67b696endsghaoqvcnr3n4fnp/rivavokekovowori.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca83933e03---jepikipijesexataji.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/347999dd28a019b61b0bea29f9c7f6fd/14960215094.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5a107kgae6455l1ejj6gtbbpr6/1490487523.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/63068342928.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/psrs243e5snpnv57t6f2i2v2p1/88921286628.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/1787066787.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gitebaji.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/23510863106.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8c279c46bb77c9e9bb4866f5e0c9ad26/ruvesatenuniwadafuvevi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9958c6e9e6---doxilazozonelogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=most+commonly+dislocated+carpal+bonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 15996 bytes
SHA-256: a7bbc5b80ee547fdf866e85d097eada860d26874be1c4f73699c8743f61e3b0f
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10924 bytes
SHA-256: 905573176398f3fd720045cc6fee6d9bfaf3201dec89288b043d16a1c4425157