Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb7b78be978acc3…

MALICIOUS

PDF

73.7 KB Created: 2021-08-09 14:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: bcb3dc32ccb163a7a219a4ba55ddd8eb SHA-1: c708a20faa95f1f168b0ebdc7ba2aa2d84fdf78c SHA-256: 5eb7b78be978acc31035e45ef80dfc7b0bdfb8eda659a56745d19c700a7855cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lawina-radom.pl/files/file/40675648273.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c51567f29bb2afb3a26010bbbfadcef8/72648774742.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/jupavew.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/42154399457.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jre4tk6uqk8uhsb08msn5lo3lc/fifilokividewisuwudabolow.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/midegopisagerugikoriwezuw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8e04e5f977ccdd8c1f3c53cb410cdc10/33572513202.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/53228234111.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/fazosizituwif.pdfIn PDF document text
    • https://fratellifurloni.it/file/14653785405.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/54995146499.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qd71nug0k6jkjd1bslfa3jpk3l/73884239048.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/palarup.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609693a39e6b9---lopexedepifedavudejosa.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/ganikudufepapobidixagi.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/74515237589.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/34674057709.pdfIn PDF document text
    • http://bctlorraine.org//userfiles/file/kasamaragomukejibijetiz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c859c72fa63---63601077671.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1316938f4---paworon.pdfIn PDF document text
    • https://labelmarket.pl/data/file/jotivejote.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608769e788a6f---69135612274.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b8670be939ca873e07cce1007b30c1cb/petomevunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=strike+force+heroes+1+hacked+no+flashPDF 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_off0000bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 16088 bytes
SHA-256: d1fc32d66100c6f456f1e0def20b664e110ef1c6e3bbb0189ffb307b923609a7
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10792 bytes
SHA-256: d589189a17ff0953a0fa700f0f7cc4e094078324b736194f1ab93d5c09b04337

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