Malicious PDF — malware analysis report

Static analysis result for SHA-256 a346d8639f3fbdaf…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 03:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4bdc4623f67bef4435abf27cd0115ae1 SHA-1: 7b0c861edeee38513988d8137b5563c6d25d3023 SHA-256: a346d8639f3fbdafddd0e1db83d4d88aa2de2df82ad71b936a4d482f00688797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=conor+mcgregor+first+loss PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb5326c0a---39926908673.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/35173181658.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/97549685290.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/35319572753.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/50127221442.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20211002_85CC9BB70AE57BDD.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/17438127817.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0272245001631825929.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614253456cb18---lanijutenefu.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/64788080672.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/17955898896.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906162318867975.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/somawa.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/peterofovaxaxivizujorox.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4186a4314037e6aca36fb746524f1fb8/80816010694.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/banesex.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/87009574494.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ceae24e792c5588295951039669064dc/1779298812.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/66442805007.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/6960842121.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/dotedomeniwewevesatuwa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f311e50202---sowudupanikimomesulobofej.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/bomotapujutelefukojimusef.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/79645934920.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/87008252488.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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 10548 bytes
SHA-256: 1c1b8b404608375f4397b1076b8bdb2944b21eb6820127d43457ca1de6fda487
font_01_sfnt_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 18136 bytes
SHA-256: dbe19fe3d2f430f7ca5f8231a126739cf65b3d9949ecc51c1120864f1ca5022e
font_02_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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