Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc104028646ba2a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 15:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87e702e9cc79dc9e58c08de5eb0c0673 SHA-1: 5deea22efc17f56c6268dd3772eb819eca5cbe2b SHA-256: bbc104028646ba2a60bded3d0b0aa580701fbcf0934e608d39e6e22c4bcba21e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The presence of these links suggests an attempt to lure users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h8tr6pkefj69vvtnu4vkbbk8q3/lokogepulameliku.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/25e58dab054b3bf22b8f0b906895ef1e/jirepevevositedozaxezugo.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/vifopuzifowisom.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/97a730f3c5fa3212267bbead6c79ad83/fujinuwi.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/muvokutajuwuw.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/gigegawiwufajipi.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f405c1ecadba9ae3c0227131dc84a064/94850488397.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4033d5108b---xapisatagobewagutufato.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/wirulivuwomujotuwod.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/38333939652.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/75063985567.pdfIn PDF document text
    • https://renetravel.ro/images/files/bafit.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n0s3b5s0cmhhltv1jeedks6nd6/vazebuna.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/57638836957.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7igcm1usi8c0h3j3890hofid1r/rozezegijujewopon.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/katawaxuvejuxiwud.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/wabikowitanaporadezeko.pdfIn PDF document text
    • http://101balkon.ru/upload/files/fovipekin.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9ceba7e340ce40a26726aaa68c862af6/tegijakavozexotad.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/c55n80or9sb0hugd4ehip8mmr1/sesawifevamiwosofonezu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/018646c63991f47c083ed5d21fcead29/32451062027.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/76916ac219509009e7cd2ec288cedd22/petuxizuxuwiro.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/63717433711.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/53820690902.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2iemiaut775po34d6iq1vntbmc/34426832214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gear+shift+knob+manualPDF 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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10852 bytes
SHA-256: d456f8108ac6d5ad8b7fffa2a79387d649fdc2309c63e526918e1ec7dfc39dd3
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 18108 bytes
SHA-256: fee7c058a915bcfaf0a7d409efc0ca33cbf2c81bcf2df664db8b20a2aca1bab8
font_02_sfnt_off00013763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1