Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ce41a9f9ddb006…

MALICIOUS

PDF

96.5 KB Created: 2021-08-13 21:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eefbb42c46a38cdca9e21afcdd7fe7e9 SHA-1: f3aac3873b6731cc1d23b6ad15a5d97cdea4c055 SHA-256: 93ce41a9f9ddb006c5a0549dbc1d54e8650ffbf3210ecc9ffee8cd101efe263a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or phishing lures, such as the one related to 'brawl stars hack'. The presence of multiple PDF link farm heuristics suggests a deliberate effort to create a deceptive document for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=brawl+stars+hack+free+gems+and+coins+no+human+verification PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d989464bb---99883052372.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/daa352e7f80cbcfe7afc1345fa16447b/dugipesematetiz.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/678010870.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/80bc5775a65cdb00db2fd68dc2fe3a5b/jefojaduduvivuzu.pdfIn PDF document text
    • http://aquatherm-graz.at/files/27195979650.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/14433159584.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r02bkb7h44nue753joe65v3j5h/gapixotudodomoguta.pdfIn PDF document text
    • http://minerva-collection.net/files/files/2135855113.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/4794986182.pdfIn PDF document text
    • http://christopherdallo.com/file/digoritexilulobadi.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hs5nd1qke7fuj9e9i65q011g44/64822020247.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xetixejitewamexolitakuge.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755d2b78c---44173206379.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5db31c89d5aa1afb1d0dfdd6c26b37a9/79381611789.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8dvunblac8vnb5e220kir560pn/55276938670.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba9621878---47992065627.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/pofojupekujisud.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/vjln9cspu1tub3ee5n7uuf2an1/gafaxomujeguzuwenegobej.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072598a2070e---59622752161.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/48842219126.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_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 18056 bytes
SHA-256: eec1eaca268b576495e21fa736665b93660d5391b607c5b254c7f994b1c81fcb
font_01_sfnt_off0001406d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406D 11320 bytes
SHA-256: 318d65c682b5c32840fce175f97bb4d8e4a7513849f321f7ec47c88408fcedf9
font_02_sfnt_off00015acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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