Malicious PDF — malware analysis report

Static analysis result for SHA-256 8160e8c7c4555b8f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 03:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78c28d49b7c821a666dce92977e0fb4e SHA-1: 032d1776acdf8f09c7d4c1d982888a6a5a8ef36f SHA-256: 8160e8c7c4555b8f37881797b7b9113b844fedeccee468422a66485fa05b5b32
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=how+to+enable+the+developer+option PDF link annotation
    • http://meyergarden.com/ckfinder/userfiles/files/soxegakineb.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/luzujefegexemenapati.pdfIn PDF document text
    • http://smirna.pl/files/file/25008461627.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ff69544e---gugunifedu.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/92513241580.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/tuzimelevisawisopipin.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/18421615521.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/52234865867.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304b2ed1ec0---97399212795.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109010720197119942jssgssu1p4t.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304903e45f3---55652112484.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/solejesixebak.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kezabekebujusati.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/77211423879.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/rogagopowajulemowavej.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gidetirapolibupisufik.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopujeritigukugipuxuxa.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/29259705618.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/1150789539.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/bopevemefadove.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/sagovawesedowixofir.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/didiroligilijivijesejimus.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_off0000c069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC069 16620 bytes
SHA-256: 873bbcb6daf09059714d7fc40823378d376893d2d492dab4c1cb873867ae8c69
font_01_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 10604 bytes
SHA-256: 7a11fdaa3753c72e324a6197914ef74cf9c713dcc4be7df1e3d5745d11a5cb26
font_02_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1