Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0971255bb92919…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 04:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4079bf5f1d53f66b3b8bc75ba8c55a24 SHA-1: 414e601a65cac5fe47a943ee77f7c361b67e6d94 SHA-256: 3f0971255bb929193cd28cd88694273a1c3ef2c7bf4298cfac5d237c870eb30a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, hosting numerous URLs that point to compromised CMS uploads, likely to obscure the final destination and evade detection. The presence of multiple distinct hosts and a high number of links per host suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/q9fj8uqh866qt5dd5jv7jdmje7/gekesupij.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b9934bce1dc0c54a0b0b0b2a278e291c/36989754967.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/204f21e14900ac582fb4b32f126e5fbe/lofezaziriredevoxubosopis.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/55041158195.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097935fd0a01---82232327434.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160757755517e8---71420856709.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/00148df7912c03ebffa667e29fa6ef39/12921580172.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/66977810307.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/rilulud.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64885057d5---nizumovikozimalirutirik.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/kujorujajixaxixisatak.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084c241370af---xatixepadefenaronasu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/81472768894.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b408d4e2---walewowuwodu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9afae2c86---sizikugujuwago.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/7926923742.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/devenodikeminumefol.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16092b116b28fa---30532023907.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e51b0d1d441ce3e5d967094f7fcf45ca/zuduvosudukenurom.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5918abe30f---jiziboli.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/kejixafez.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e189234aea9d3aa47cd581bab0c4659/wesipitesos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chocolate+cake+ingredientsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/80f37c60735375d1c7641858a3b121c0/kelebenexedefefa.pdfIn PDF document text
    • 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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 17960 bytes
SHA-256: cb5109d122d33ab59af87e8707a8fa472650d382c8153040c8c20fa18665f833
font_01_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 10772 bytes
SHA-256: f1fedb6c7e8487adc32ea6c628907d305a8ed19fcf9dda40ae01ba86da11ed7a

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