Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6966bb74269cdaf…

MALICIOUS

PDF

84.2 KB Created: 2021-07-09 17:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9dbfb80a32ce78ce1b6e37e011493037 SHA-1: b2794e10081e0a9474dbaa04852625a489b87077 SHA-256: e6966bb74269cdaf80b106c9d8b801adef81d6485b6b5d484b7ad02aeb24718d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous unknown and potentially compromised websites, likely for phishing or SEO abuse. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c55f900bdbd41449561dbf90fff224f/45943714504.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/42066557125.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/bujawizufofawudofefadusej.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3ce7e4011056c2af7cabd3729bfc8b4f/besuzokepix.pdfIn PDF document text
    • http://cloverdiamond.com/file/jetinuso.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/obv7f24cgno8viqc5s6tv23kok/xelaxexizarikopix.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c171b4d---lulokukozebog.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/19353186802.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/29e79cd6fb38c40974140b4f08470e19/ratisalokoxutumil.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fisusabigomaditukite.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1a5ad5bb---tebemogi.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/54153709033.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106120112577765.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/5791776191.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/walujaw.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0d7b59662fc9c2103fb294d29d8817c4/verizijigaper.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/tejilenanoxigurokiretu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/junexavu.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/93642730695.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/vejiluxinodonazojumebif.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/kopopewofezetawudexu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/16ce186350f9d77b97b22cb12b8eebcc/17325330217.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c600319ff66---54444227394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=differentiate+ionic+bond+and+covalent+bondPDF 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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16708 bytes
SHA-256: 25f1b52133a120fcb10175c9ab9005c0b7eb9cd918f2adc2784991f0fedbb806
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 10508 bytes
SHA-256: 5194530c73942f28de52e0e8725ac57218e90f7a676bddabc02904ddf8307017

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