Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50146d4c4f86e88…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 21:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f59de9c6004ffd5925d65de080d11482 SHA-1: fd7ddfd5257be34c9f287f49d09ff28e7897ac40 SHA-256: b50146d4c4f86e88f0f0d5e2a51e27a01d6dd76b56ff07486d89e6fc71e85548
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=physiological+psychology+textbook+pdf PDF link annotation
    • http://lobanowscy.pl/userfiles/file/wivegaxituvagidejinona.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/15432599174.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/14646589416.pdfIn PDF document text
    • https://aashianarealty.com/file/70398526386.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/nexijosamikeb.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/71345392127.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115c388c8a12---lipilisijifudikirum.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/21633825639.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/zebijabovur.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/81974785116.pdfIn PDF document text
    • http://steinemann-ag.ru/veromakaletawiwod.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/72313243640.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/tajijowazaseketaduv.pdfIn PDF document text
    • http://distributoram.com/files/file/tawaxuxiper.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc49c1c83b---tekokajiwejiwesogobapof.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/78194795479.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b530cb947a8---tuvugolomoderewadi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/54634686213.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/40828670927.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xosurajuposib.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/wikokepuvodevijusegaxina.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/46949365295.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e392573ca6---wuwagafawimibadi.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/zateluderegi.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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 11144 bytes
SHA-256: 2c4371ecf387a0e378ff9b4ad65107dbbde21016bc261075259cbabbf15c83e8
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 17796 bytes
SHA-256: c033a9055c8bdfc846942310bf761efb6d7c2a3f991d2658fc48e09f05cdb005
font_02_sfnt_off00013989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1