Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d657f59636c14c3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-05 22:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d81957ce06aaa6178eec3d4b2d5fbd18 SHA-1: 7140d32dea535c171c42b89450b3d62334fca538 SHA-256: 0d657f59636c14c375cac67a6a6134ebbb8b95a59fbfa47ecb8800b28b7bc85d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://laboratoriodiprogettazione-ve.it/userfiles/files/65658110306.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bce8e8601---4470874594.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3v0mthp5nser60l2di3qiknqc1/37893838119.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/986068465.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4eb4820e6d0e1cdbf383cb4aed47e3e9/wuwiluwevisofitusolif.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f9a648f1ad81993a4e562391ddbccadb/nexepelore.pdfIn PDF document text
    • https://o-dance.com/upload/files/35695160582.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/72466709843.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609541a0633b2---tebopupisaneduwenapaxave.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/tewola.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c128cce9378---lepamomabetigamonolirov.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/gapawoxejidub.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1fd54dd883150bad5f1d46cb49471a38/62518632361.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/33623080545.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/fupolojunif.pdfIn PDF document text
    • http://dfanchem.com/upload/files/97816972609.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/95279157.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210821/file/16294800834849.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/tejixogipaboxop.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/367fceae6a775398d855a3867b7b1c74/51759294934.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/fazuxofuxubomajem.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/21285193579.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/da72b0lmbphah6c47j3lma5h21/70135227296.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef58f021b---senawevuvagezisobunaliko.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/18420813049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=handling+objections+in+sales+pdfPDF 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_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 10956 bytes
SHA-256: bc22872beef7bbeba172cfecf7304e22a791376c55b27f6ce780d77458019ef1
font_02_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 16008 bytes
SHA-256: 429033221a55e13a17d9c1d01db110a4c0b9f0cf48b9291c19439deab29ba1d2

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