Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa9bbc29f2c4504…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 08:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba59889e65238c64c3bb67fb829ef41e SHA-1: ce459666c2348543e7e604b1690a4d105b1b6264 SHA-256: efa9bbc29f2c450489831ef1954ebc330f7ad19c01b959e45562ba75b2f05177
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, including those pointing to compromised WordPress uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abriganature.centralcms.cloud/galeria/files/13310202041.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/jobakokeburiladunekase.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/vilamesenizezafa.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0dd9516055fe6d92a21779453e20a714/fufewipajozunanuluverot.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613245d314db7---28934075561.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/lavewojazodi.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/jetibozukexakukun.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/nolokibisefonuvoxuwasoze.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/12264539570.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210904172124.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/7750628907.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pemaxomanimopilisewunogik.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/16353290500.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/wofelabowaxuvuvuroboka.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971c6d7821---91578132979.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/8474493.pdfIn PDF document text
    • http://kco.su/userfiles/file/33197870625.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ljk5dvirijkm7re066var30eln/fabopevo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/go1b2tbg8fk8i30ggh9blmeft8/91227726926.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e03911e388c902a865857b19988116d7/xemekitir.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/65729847609.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_C468BCAC4867F61C.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/rusugoperomakoga.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/46555977391.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011309018110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=call+from+computer+using+android+phonePDF 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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 11200 bytes
SHA-256: 1802ba714879384776735dbf85185775d6e9ae4ce159e700788cc2b0e6bcbdac
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 17916 bytes
SHA-256: f3f95c94f27e4fa4037b998385c18c81811781a866de7c8ed9b1f3cad048a3c2
font_02_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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