Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6d1ecac48495ef…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 13:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f5589751c828bd400e03757cb37bde1 SHA-1: 58dc9b71e43a4ded6e50bc533db592875400f287 SHA-256: 4e6d1ecac48495efa9db3086a2105ca6304384fcbd416880488f7729d2ff0765
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=how+to+stop+facebook+notifications+on+android+phone PDF link annotation
    • https://s-serviss.lv/userfiles/file/tosagax.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/tadimuvimidavofuzifipe.pdfIn PDF document text
    • https://salonrewards.ca/images/file/japolowonitiwe.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/20389471523.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d0b2c8d8---66098377929.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/bewizo.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/64467555730.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4fa5b49e8a2478dabe469a8da053f24f/43991629378.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/77218938483.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/86809501687.pdfIn PDF document text
    • https://invision.buzyhub.com/files/bowevasudivomodiv.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xewovepam.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/gidajilelogolamosifakexi.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/66563089074.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3k7kuf5sr6663rjocb186476t9/bidowamodilasiti.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/8052260688.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/92039663489.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/66283436299.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/xudodujugu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8996e637---91512312212.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/46891843875.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45897674830.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/33040438739.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xozoxilomazog.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_off0000af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 14812 bytes
SHA-256: b548ffb5a0aa34c78838161dab0156daf88a981fe7baa2b55196fb9f52273a12
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10980 bytes
SHA-256: 032b55a3f710441044318d5372e50acf83604426ada09e1e9c80e15d5108ca35