Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86ecae684e34730…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 13:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9856d1f65e3e7244d971ae6f066a11cf SHA-1: 6e05bc69f82b7ef7b8c8eab3df7be306c760a857 SHA-256: d86ecae684e34730cfb34fba20082b2d8f45fc1ace61ffadea348f28ccc0c713
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The document likely serves as a lure, instructing the user to access a password-protected archive, a common technique to bypass security filters. The presence of numerous links to compromised WordPress upload directories and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3c76da8602a9d9e8dfc8078a98635c5b/xuzododirivunedidiwi.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec453a9f88---jurobuwoxoxitekesibegopek.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/mazopuzoxulud.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da8a8b80fa3---xomuxasakafopokivixowapu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827b72d1bdf---42209973805.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab9399e59---putagokirasizovuvotuno.pdfIn PDF document text
    • http://faradbox.pl/files/file/juradufalorotosagomakok.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5dd2033sqqadr20enppsh5nrie/xuxuzujunoxu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e6ca925a140ecd3ea526e2ecbe57191/rorusugedaja.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eae7c6fa9---kisajizib.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/ravemepuwagodumigawizo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a095ccaa2d7---59284159760.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/800c83dfcbc7f15c7b2e4f3211312d8c/negupokozopu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69456434491.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/704618bf03447786adeda28548a4b5d1/90496373718.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/lukugagafinoluwakege.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c52e939f---banafuzenaluxivemiga.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/wazotodi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f35d98025---jururux.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86ee54372---ponoveratokutawed.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/lefapurarap.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/11122162201.pdfIn PDF document text
    • http://blatt-gruen.ch/files/gosefeko.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8045be970---minap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=i+forgot+my+password+on+my+voicemailPDF 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_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 17268 bytes
SHA-256: ab7b47a9a6bc16f5020b30b1a47abb2c2ed97ba39aaa0b2d2ff92facf86a8300
font_02_sfnt_off000131b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 11180 bytes
SHA-256: 8ab6314569b696d20a7bf2b6a52b7e8b42c4d8742fb28abc882499a73d5e63a0

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