Malicious PDF — malware analysis report

Static analysis result for SHA-256 575f0c4c900d16f8…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 22:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b12f6a9994201ba3d25460451c762178 SHA-1: fb18afd90e1116caeb7c63581cdbd5b661b56362 SHA-256: 575f0c4c900d16f87ee9f065d21950fd9dcb926d0bff8cc4f8982aa89fc12b2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external sites for malicious activities, such as phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=syncope+medical+definition PDF link annotation
    • https://abrasco.org.br/ckfinder/userfiles/files/xidapelagi.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/bafifof.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/soxakoxonitolizu.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xefizikakajeril.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16149bd452f9f1---75825436684.pdfIn PDF document text
    • https://31app.com/userfiles/file/fifefapabezikekudolo.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/21239761548.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/43325582743.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/sikuzoj.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/14748262822.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bd90d07c---57796728527.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/77878838263.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/33811312958.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/rigakoxatixesalefirudak.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/dujovubimipebemitadewed.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/44081719219.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/zitupali.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nesuxoxiju.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907134658157697.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614688512d759---8923715763.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/zusobodasofikaxepesutevaj.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/zejasedefipabe.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/sokewupijasalituseto.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/lamipaduzedel.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_off0000b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB032 10704 bytes
SHA-256: c2ece888e33d117d6ff862de1a183abf5305c21d8fb6cba554d050cd43ad5a0c
font_01_sfnt_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 15736 bytes
SHA-256: 3560bdc065aebb7ff944137ad67854b690e83bbc50ddf7269040721575200c79

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