Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa0f616be2ee6c6…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 19:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6b20d65f95ed71cdec80b2ecdc33b4a SHA-1: debdedcf299f977ef2a2afd02a8bc36b9b9bd716 SHA-256: 0aa0f616be2ee6c68e2fedb15a30408ce531d29f1697bb84bb71bd8624715a19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised CMS upload storage locations and disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content, likely through a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=transformar+em+pdf+imagens PDF link annotation
    • http://galettedesrois.hu/userfiles/file/dovexepatapumasorizeri.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/2927704144.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/m8arr7ih9olbo2lcpopb5am5g6/87423008473.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/44o8f8ktnunf8tce29lqim3fni/zenisafafe.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/22038763879.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/92373145819.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8a1354b8---nonelazuwogit.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8264f22396a7ccd152771946623a8614/jesakonupenijopodirozeli.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b574ec14744---gozarigipobovute.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d5441c31---kanowipuwuxajonorof.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/1623261684.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160818e8c15274---82707641933.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b483cd3be---5038599133.pdfIn PDF document text
    • http://houselandia.ru/files/59752754386.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/92803458528.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/53229037044.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210713130149.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee1b41c0df2fe69d1900566f116e7301/fonogugisutabebafebemo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0059741ecd9f9c0013e3fd47fce7b970/jaromuwizut.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d68f236ae922dcf95c728a2967edef67/79684331253.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d9ece8ea3---ditorelefikegirifizepav.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/95533363179.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881b1818f30---vifejaxuwolixozaxejoguk.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210630030445585.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2c20bb0316b3f83e25fd17f6009eb4ae/97016433417.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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10660 bytes
SHA-256: c4dd27be3fb1fac6a7041fb5462eec9560d9b120de95d0adc8ccd6185d62a536
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 18296 bytes
SHA-256: f59764898a866dd0c3e799f0da24d0ab70a265c5348569a1c3a75b96ef509428