Malicious PDF — malware analysis report

Static analysis result for SHA-256 442a5b2887d10c0d…

MALICIOUS

PDF

93.9 KB Created: 2021-06-30 03:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8bd3abfb3cdec420c320a408ea46433 SHA-1: 804327076ff2b08b6e62387e42b92484d2c08c40 SHA-256: 442a5b2887d10c0d035c21cc51e3110cc4b6321ef4632b6db2f7264be5afe5fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document's purpose is to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083a62e3a553---288098970.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/15208af473771f16c79db46dbe8ffcb7/jivuxijekepaj.pdf
    • http://dienmaythanglong.org/uploads/files/legaperunada.pdf
    • http://dmhu.eu/uploads/uplib/file/nalonaxusajexojemilesu.pdf
    • https://efficimm.fr/userfiles/files/49595785122.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a6fe03797d61a92f442ad0a717bb89e2/88964330064.pdf
    • http://aisef.org/uploads/userfiles/file/file/nirozukaweg.pdf
    • http://bighost.vn/uploads/userfiles/file/wexamuwu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd6d1bfdd---sawer.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c445ec421---82684238969.pdf
    • http://extracam.es/app/webroot/arxius/file/ganorakolerasi.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpnj0pji0c2k8qkb3ahp9ba7rg/dazemolizurufetog.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3759bddc8f2530a433ceebd9fe168874/6791927440.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ed5cb0874626e3160f6062bf65f3d2c2/48692899998.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835088c5771---56875266985.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f8806b37757b87394afbd305fd1c1e36/divumimuxivowitar.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd246f1ccf---wegijapikosix.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/jujiwitegisaz.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c5216a373770c099ac226fc5c2de9222/50166895419.pdf
    • http://truhlarstvisollner.cz/data/file/voruwukegolifukukukobib.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/jupopufob.pdf
    • http://charivne.info/images/file/wugamemorugapu.pdf
    • http://carszana.com/image/upload/File/sagikokoz.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/75cbf0lce4i2bet9o2s2028fv7/37648023937.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb7c52716---furenokifevuzisawipevipev.pdf
    • http://longchimvac.net/app/webroot/uploads/files/64629628171.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608289d1a9634---64122092209.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gcf+of+54+and+30
    • 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_off00010aec.bin
b03b0dcd79cb6fb663605c5f69fe75954e2e0777e37d780620d95786aacabe76
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 18140 bytes
font_01_sfnt_off00013a7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7F 16792 bytes
font_02_sfnt_off00015296.bin
2f1a7a763a5896d82bd2daccbb0d19584ba6549604b410b9671ec40c052da291
pdf-font-stream PDF embedded font (sfnt) at offset 0x15296 10376 bytes