Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a4a44ac21cb487…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 23:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb5eb2d4b3e57345aa2d6968b3ac91b2 SHA-1: 179c5644498e31e0170c5b0b1f8ec1f8663f7973 SHA-256: 92a4a44ac21cb487a3289367a612cbdbb9e77d528a574e988b6c73e90d46ab88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=popcorn+time+apk+mac PDF link annotation
    • https://libertyrealestate.in/ckfinder/userfiles/files/kurelazavose.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/29ab31ef7f99bd69c269f5557572bfce/sonufexone.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/wuzinigivupunul.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/dodisepa.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jabelojulebugibevi.pdfIn PDF document text
    • http://datcat.vn/2018/file/womumepuxumumebevibu.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/34260415843.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130aaf36b729---fijadawokovagivobenaj.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/zeponexugopewurunowaj.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143221d92b59---18118128079.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wojenib.pdfIn PDF document text
    • https://olterus.com/contents/files/punavefiwotogapaj.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_D772DA8555C85709.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h6jod6kc0viq8tc0h8bthafne1/25139362690.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/jiwupuduravexuwike.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/24042072715.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/92102701206.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/butojidinejiluguladut.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/pawixabiz.pdfIn PDF document text
    • http://chinalabware.es/d/files/76531217614.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/52689415338.pdfIn PDF document text
    • https://shevian.com/images/file/sakubip.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zefezofijux.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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 10416 bytes
SHA-256: ea26fba9be25797687c57fbbab559d5e20ca1c7bec186a555ebfa0bc384be37a
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 18224 bytes
SHA-256: f2e66f11cd321fdbb978d736cafd1051c2474f3e53119065692b849fb40b1576