Malicious PDF — malware analysis report

Static analysis result for SHA-256 64898c4b0f270403…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 08:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 087c508eb906e29508c3b2fcf307f9fb SHA-1: eb32c8a122b734afba5f61004e5abc417b0a8cbf SHA-256: 64898c4b0f270403621faf2452a2ffff41559218997f82672fc282f75ae42ce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and other potentially untrustworthy domains, forming a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://intertexmedical.com/userfiles/files/66978619168.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b325d0a103---31370004285.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/96612722653.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/zedut.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/22679793873.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0ad28b7c48ffe15ef69d7903c4cfd445/wadojixilagugumukoze.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/50686780155.pdfIn PDF document text
    • http://health-bridge.in/upload/file/79710677206.pdfIn PDF document text
    • https://vitanov.rs/files/44843295135.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614257cabf414---87396369661.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/79858086602.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/rekovibesipimupatu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1d4844053edd0641d580c1ec76b6a0c7/rolakutarerixos.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5fbe0709c5b6e2526b3f7dad13c478bc/3657920730.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/28265815683.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/mapozomu.pdfIn PDF document text
    • http://xfswchem.com/upload/files/jatofoxijemuludanep.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec8b6f8e0---78175789676.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/goluxonogafijobegapi.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/85283212396.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/zapasaz.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/miwologesifuwefevi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/71556729594.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/nipisevebepevimuloxa.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091315203559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=encrypt+sd+card+on+androidPDF 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_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 17544 bytes
SHA-256: 57ade599fd647597df4b920e0a822343f16e794528ce878439fed48ded0e0329
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10428 bytes
SHA-256: e4756f608016a2889339c2dfc7df076fb1b3acf002c968ad69c7aa422e71a989
font_02_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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