Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31e38ba8efcd67c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 21:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad086ff37d03d9449b6f2a6d703fa83a SHA-1: a7d1b7a1dc8f527d2888cb4bd0282dd7d34a92a5 SHA-256: d31e38ba8efcd67cda0ae87e574b47c1e1a1ccc9693a69a8fa6a3f415f21b7ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

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://crewmak.ru/uplcv?utm_term=instant+cleaner+apk PDF link annotation
    • http://sicompk.com/survey/userfiles/files/20140290856.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/zeduligiroki.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/wobolivunu.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/dojonenalejosetupir.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/tukazenaxunemuvozeg.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/07acef84b99e1fb37d3430fa6e01a589/57234462096.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614092bb873c3---sixisax.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/loremapedabagodaluvo.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/757900072.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/20875239937.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f5edf8b0dd422b3b6dbe2fbe1f01b219/paziporopekim.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/38fcdc24c5597a25f4c0f065aea3e3b7/58949562549.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/22076922970.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/tesexudibobobawetozimuz.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/79512552752.pdfIn PDF document text
    • http://terrietanaka.com/library/files/45819409035.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/ganaxeneduno.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/22016501839.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/190a4cbb70f3f8a7e53919b824bd3e59/26151882482.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b43b3603---38010755229.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/fokazokisejo.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/89248242971.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/tixexeleduwulufizofugine.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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 16528 bytes
SHA-256: 20276865b50271eab731060b378ab8de34f938b8c7d4cc001dcc9db93e5dc981
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 10196 bytes
SHA-256: 7f6b1ea88b4de604c954ae90289e92b76d7bcb2a82777b8814f518201706de4f
font_02_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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