Malicious PDF — malware analysis report

Static analysis result for SHA-256 7526f6e4120b594c…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 01:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40ace4fbd6c8cc73824b42a08678015a SHA-1: a5bc112781ae10579f91177d73302781d6020a52 SHA-256: 7526f6e4120b594c8f92aa823c1d0b2c631f8baa6a2209e1fd294b944d1b45bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/lukugagafinoluwakege.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819b5311e---mozisuxetixofuxuguvarowut.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074134352329---xusurekigimekulotopudez.pdf
    • https://alternativecarrepair.com/userfiles/file/13234070610.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8d5c2a987b6b324f1afb4d5b5d678d1d/nemewefazavaj.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160961d2dd2cb9---momadefaramolemazurefar.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/84584e483a3501de84e64501a8195d0d/berekuvavogu.pdf
    • http://119hero.kr/userData/board/file/fuganefel.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7a58fac917c7f939410744c3192590ee/sakuzomefimibaramodosiwim.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vtbr9klfq5t8rpc7bl2e4a1cv5/pawetar.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/73fa748993ef10299f0a608cb562ae3a/90645077766.pdf
    • http://loadcell.vn/Images_upload/files/62952796217.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f29cd00cd---dabuwijepewexudasowasud.pdf
    • https://aawyx.com/sites/default/imageuser/file/85449336128.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3nbqtp6tu91boulebnd2v7bvg4/tedujaro.pdf
    • http://stellarp.com/userfiles/files/4344130064.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/57d774329da643ec2387078766d164f9/biwubazizorugujokipe.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811f5d28453---bosuxuf.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f4c081d8---72900572103.pdf
    • http://falerisztika.hu/tmp/derobolekij.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddfe60cff---82586606104.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+in+slot+frost+mage+shadowlands
    • 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_off00010876.bin
bb2600eaf5c2dec113bc456346fc9d362aee63513dd09ab387214b74dcf9c03b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10940 bytes
font_01_sfnt_off0001217c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 16792 bytes
font_02_sfnt_off0001398e.bin
f03c1d9f9cd816f1871b158a497b9f82b563032cff7fef129fa0cfce618377df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398E 17732 bytes