Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fc33ae26969fb9…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 23:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c216ff7f64ffbc7b7ba4199d4ca4b54e SHA-1: bb615a06eb81be81e1ae076ee1fa93f0156c1fb0 SHA-256: 30fc33ae26969fb9f4bbd421398852750f4cdbb589c6948f889d79f8412b65d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=most+popular+android+apps+ever PDF link annotation
    • http://mtkshop.com/images/uploads/file/lemagisegukotedikefori.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/10358920906.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614398f1a559d---13818664937.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbdeb44a3---38781632556.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/nivukokumajamokarub.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/zawifelowudozinenuwe.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/fimabitamuvumaxigatebulol.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/10029828322.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/zaxaxemukosalarimugoxiz.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/wekejagitejejisa.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/20129916799.pdfIn PDF document text
    • http://hk-keber.de/images/file/porisajomakiwegufetuj.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/34626152384.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/88930434456.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/bafadorivatinomomifolelel.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/kojajevusuxuvunisugo.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gebotefes.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/28810618027.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1a0bca2cdfb379b1830c5e38d555f9a4/13652801844.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/mosezaralovutemarofap.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/lubimulevudesowewixepuk.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vomalapadipilur.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/bimabigumun.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/gidiworanixaniwebi.pdfIn PDF document text
    • http://boldogelet.hu/media/vesuxixixijadesupo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/80146818408.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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 10544 bytes
SHA-256: bd06d28115b153df5b5ad4e9b06eef0a5efe7f8ea97e514f173c59eb510b1af6
font_02_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 18460 bytes
SHA-256: 552d017cfec6023bffa6e7f516cf3089a0541d7d19e695239b4c6475c513edae

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