Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5f569879a8cc00…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 07:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20b5b5f3867ce49591b9317b40858852 SHA-1: be7e9dddfd09165074075ee1b2ef8c684956286c SHA-256: 8d5f569879a8cc00ec96c5f436113a498983c9ae955680f2ff2b58cd6f91a460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=food+vacuole+in+animal+cell
    • https://accuratesearch.com/userfiles/file/24958651008.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a5pmnke7e2mvcvu6db0vamedo2/8675709624.pdf
    • http://matstravel.ru/userfiles/file/25281026947.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a3b787e90e999c76e1696237793da63c/pakebaxilit.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/62640b5b4ed737acf0b6401e219d9343/nesarepozifozo.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a8c426173---wenuviteledazuxajif.pdf
    • https://bamor.org/userfiles/file/56087484179.pdf
    • http://curry-box-deluxe.de/userfiles/file/61281479239.pdf
    • https://adepotcustom.com/UploadFiles/file/20210428083201117.pdf
    • http://jhferry.com/data/fckeditor/file///soluriragosemareriseg.pdf
    • http://sellmysayarah.com/userfiles/files/fiziduwevojugizikexuk.pdf
    • https://burgas-remonti.com/userfiles/file/rozepijujalunoli.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5f0d001649733fe50a2c7f1f560c8bdc/63445938509.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/39924082438.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c930514e---wipifolemezipabivideb.pdf
    • http://studiosiciliani.eu/userfiles/files/wofadas.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/14ba8e9b472370eae537b0cdd3981b15/rolagaxigowonesoka.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/xavipetisinufareguxosem.pdf
    • https://chung-pei.com/userfiles/file/83590468544.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716fb0ecb3---39756142931.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/7cebdacbd603e9234464fd3040c8b729/56044104096.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f630.bin
2bd8438e015956f6c832f14343be7a14bdec8c624a836c0571d7f6b4423dadd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 10308 bytes
font_01_sfnt_off00010d51.bin
e6a021d1d7daeca0b782af7c55497b6257382c713eee1b20081583acd8b44d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16856 bytes
font_02_sfnt_off00013928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 16792 bytes