Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab980e3a54326931…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 03:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d738c56610af975cde56fcad8f2ba9f6 SHA-1: 54bab003116d3cf825cce59a1bd921762710ee53 SHA-256: ab980e3a5432693185de3e33c2ca004b2ba6dc074ff5e7220ea3a117fdfdef2a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest potential exploitation of PDF vulnerabilities or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hasekei.jp/userfiles/file/pajofijuloladolususef.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608075d0ed395---fexurobegon.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/tetekemijugen.pdfIn PDF document text
    • https://aspirans.com/files/file/59324196474.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8341d646287c4b799988af9b99403cf0/zuwarage.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/82342295821.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/59582647768.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/86465107122.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rupus.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/83186f19e28d73ed1fac7419d7c10a0b/sakipub.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/33193331160d3a5a1c8343.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607032f1d217c---55253370002.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/63829179423.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67fccb8ead---diniberosunibisizew.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/88453470807.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f5a91eaf---99183144204.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e166bf88---guzefi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a1b39a441f3071528269df2934b384c8/xosexipafefakazizaxi.pdfIn PDF document text
    • https://mmszke.hu/files/file/54730665972.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806666cab9---xoxufixigarurugukuwubav.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/vebojilemiwotowumelovizuk.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/todasubavibaxomigebaf.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/eaf759312b74a26147c32b6199666de7/32973990716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=non+shedding+dogs+for+adoption+near+mePDF 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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16660 bytes
SHA-256: ed471162a3027de4ce55eb0359ee7f01855ec421545f02af52a54178e0179776
font_01_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 10876 bytes
SHA-256: 1fadcd5de664e4f76cd5200d165a0a6ccb2b4faa5f1408dc69a3d6961132ab5d
font_02_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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