Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68d3a2a161e8505…

MALICIOUS

PDF

101.0 KB Created: 2021-09-07 15:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ae3efb52a5066d461b3326a14b6099c SHA-1: bb8a89db24b3a08cca8cc0da30d8d3baa8cfc433 SHA-256: f68d3a2a161e8505a3e34500eedf471b30d7f037cfc817b9c4754f0fb1be4b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.kowel.com/ckfinder/userfiles/files/1627955694.pdf In PDF document text
    • http://discus-rus.ru/upl/file/16842645767.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16114a12a00120---tipetozofete.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9fc8ab709620cd8beef26f2bea52b43f/gisiteratenirobog.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///68904399416.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33438b077---13599919236.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d16e8087af4c0ac8e867ba7d92332bfd/32620443434.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3bacf03---zajoteberiga.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc16969cb---kowowediwozekijamomilidal.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeba33dbf7---kepesa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160809cda3ccce---zekeg.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/45794169018.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/talaw.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d499778199de6ba87dd3eadb63ab4760/98519544785.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/mi0l35fujjn8p2ev9kt582s4tb/46173535597.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/63vv1qigebhvl3kfmhp4ias3es/depegizif.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb00226a7---wuwalasosizibulesefaloz.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/zigelabelejatazi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/fepivijuxavupipurogu.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/38718827481.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d0d7bc15fb39d8aa72ebf8083a51a44f/64565371896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=algorithm+performance+analysis+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_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 11164 bytes
SHA-256: a0ea3e241407a50f9943de18b099b1a2125eccc18c6dc426ff8b1aa11f56522c
font_02_sfnt_off00014dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCA 21440 bytes
SHA-256: 030f8041baf3ce5148c308d8db75c3d477eea982e53920fb1e0da4e7a4b70f41

Open this report in the interactive analyzer, or submit your own file for analysis.