Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde02aef2978c640…

MALICIOUS

PDF

90.0 KB Created: 2021-09-20 13:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53c5282ef5efff30993b1017cab0c247 SHA-1: 98a183f72567a306af747d9caab277a00647b325 SHA-256: fde02aef2978c640464abdbf6e8828f1abea325fad5d32f96cd1671f3e54b96a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=kodi+movie+addons+august+2020 PDF link annotation
    • https://maggies-handmade.com/UserFiles/files/zasatifajan.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4evu2uar2kfk8a0eg1vgh86ib7/65377190921.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b9bbd9cbdf36af1cda1822e543f9435b/45244792295.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/fobusasurosafelesala.pdfIn PDF document text
    • http://traviet36.com/upload/files/53055888573.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a75a93f15f75bbe052507907bd2caa03/90561248356.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/28539236744.pdfIn PDF document text
    • http://vpsystem.com/files/fck/jevobibutalil.pdfIn PDF document text
    • http://atya.eu/files/file/zawosimorasowixakok.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/bipinodari.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xewigo.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/72813089320.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/fivofodelijokowukejix.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/7450750439.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8490542ec53dad06368534289bdd65b9/8585750689.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/37229644804.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/65582212854.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/jixeguzaniwuzum.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/37537316519.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/17789504616.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/20221116298.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/35020787578.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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 18804 bytes
SHA-256: 96a8ad1a26543ca7346f7508ee64469f96998ce5b7d02351d8ad0e204daf8c87
font_02_sfnt_off00014256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14256 10844 bytes
SHA-256: 991fcf192be2a17165475421cf853b053a552f1a4b1061f9590de25b0af3f983