Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe079bfe02862e09…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 21:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b71410f6123fd8b547626bc9f2ed2fb SHA-1: 70440d79c16c5a0e8de77a14dedb27aad7205d88 SHA-256: fe079bfe02862e0932f0f123f2c8531de11d8f4f87f286979d63a054ab3eae35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tongdaidoanhnghiep.com/app/webroot/upload/files/suloratuke.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/86223a3acd169c6220de83c2d659f4b4/92095107041.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dt9aqepqk11g0st0ancshsrgrv/9928225138.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/loxolokikapajilinobop.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/nakopizomozisexad.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f68424baa2863d1aeb95b531a788587f/58430831095.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/vaxipupubobejaxa.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/foxobidegamibitegojoripux.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/jususabatuje.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/xagube.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/6753949521.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210810_094344.pdfIn PDF document text
    • http://merwepizza.com/upload/file/51779405270.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/sunuzoduxitok.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0434fc4693c1a044889cadd09887785b/buzudidijizub.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dde1c958---kagaxumolet.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609187f6699c0---xipumetunireseboxila.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/romudajowipozifusoj.pdfIn PDF document text
    • https://mavibusiness.it/file/50923378867.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121723e3def4---bazunibubolaxi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc3c55e0de---20465260763.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/89892510520.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/pebisonafogosawigomej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=vocabulary+words+with+pictures+and+meaning+pdfPDF 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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 17264 bytes
SHA-256: ef7a5ebeb25b4eb2744b1d0f69f92d276704952edb42930d82748a742c33d596
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 11476 bytes
SHA-256: 222586abbae3bb075b82366ce0ef926240a339d0b5d6d2d5e065169cabc19f68

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