Malicious PDF — malware analysis report

Static analysis result for SHA-256 3882c4852e33f1ef…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 01:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 13474c1bcf49166ef823edc5dd7b987a SHA-1: 0029636f721d7060145b520c81f7b8deee447a00 SHA-256: 3882c4852e33f1efc5e3c4b8145e083998ad210c56b53c950b9680c9f616f6e5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to exploit PDF vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://caopump.com/admin/userfiles/file/47981304492.pdf In PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/48813871206.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pugopu.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dimovelawavufiroxumefevul.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cc952ab9---kileka.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/83067532e9f76d14cc389ead6b673dd6/livofusogilujo.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/nulazasurupawot.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc99eb9126---sazoxubesi.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///gatizemirasaxefowifazu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa3a1316e---fimiguvinil.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e41eb564e---61141778430.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/jegepoke.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7nth0lr7lu8og0mnqesbisnuss/66833652873.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d26a1191e---4196766508.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099368668328---5089976940.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebf2450a3---wejajumik.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-15/20210515154952216808.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tukajisivuvusiligojutabo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5b68d255---88941503859.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a77e123ed---dalumegenopiwugumolip.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/bfm2qacsv288r3p6ok7mlj8csh/10940683002.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bvqo6bv6i4b97ocv93rq9qq0nd/gumub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=define+energy+levels+in+chemistryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 17092 bytes
SHA-256: 7950e8a4b7fee988f894470f9195e75111cb7b57801b3df7af3b771dfcb09e63
font_01_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 10680 bytes
SHA-256: c949884626fe5f423e09c01320333eb5bcedc1d04d126c51ade00c42a32acf0e
font_02_sfnt_off00013bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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