Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20c0401216fe09e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 20:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a7f12b0d9b2ea7b22042c8278c9614f SHA-1: ea93aa248a10e5bade189a7eaa4a6752e3fd9b20 SHA-256: a20c0401216fe09eaaaf09e98501e54119c60154c07a90319211db3600f74c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The document's structure and numerous external links suggest it is designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://pdww.ru/ckfinder/userfiles/files/82208691717.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88f33475920d42457a5d0eec240a5c76/86172862055.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c32c0b00c0---rudonamo.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/ruxologeto.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/tomunuguwodaxugi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/65417533647.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_15EA16C6B19FB1BF.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/9341363459.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7211f2b311ef71ec2c7b1eb5025ce096/19621306057.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/zogososexapebovazexiki.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/9621425988.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/xudisujenozope.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/xegiruzetalasemiwo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69f88ab30---rosumomilijuv.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/rekoverop.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/gavesagobe.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/wupikexifivosivix.pdfIn PDF document text
    • https://ms02bet.net/contents/files/monexamurokefuposuse.pdfIn PDF document text
    • http://cpils.com/userfiles/file/katoxuvowaxobowox.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210923063014_a5mg4y.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/15134261267.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_8D85DEE0B26E614F.pdfIn PDF document text
    • https://kimcert.net/E/file/83341938854.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/27212151007.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614beb49735b9---9802975110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=game+battle+destructionPDF link annotation
    • 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_off0000b0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 15544 bytes
SHA-256: 3178686251a9a240d44b8d0173515bdcfad7163a5e9586429bbe16ddf45d5446
font_02_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10808 bytes
SHA-256: 9a13fc81c8c72050b1819ff89f1705fb51325f7395977f787e8cc17312995c61