Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd956b9f19341c1…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 11:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c86f7779e3e1fac69d2e793b93d66db8 SHA-1: 25db4cf4d2e0da71a7aa91f904f431df99cd805d SHA-256: bfd956b9f19341c1421fda3972df6880825a57872986a1512616527a235dd4e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The PDF contains embedded URLs that likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=ba+1st+year+all+book+pdf PDF link annotation
    • https://greenline.bg/userfiles/file/65434838470.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/80316992622.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/59385566342.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/59370728257.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160702d3e72792---latifimenupasanugozidud.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/jebulatojodafugazaf.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/jelagazijubijuluvalu.pdfIn PDF document text
    • http://cartopack.com/Images/file/lemuvez.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/78055830129.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/2628020801.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/xoretasakipuje.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/85571319141.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/libapagimefapimolewosu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/09bce2b6e9a991306aa1b24ee8081369/76426619347.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/tizudop.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ee6179268---77763596579.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67860679558.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/temexiwakaferuwi.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vovixejikizevo.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/figadagafepomi.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/dekilelazipexusujigaf.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/45631413234.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/6439529106.pdfIn PDF document text
    • http://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/wanijikefimagerofa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mefekifobujusumano.pdfIn PDF document text
    • 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_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 18744 bytes
SHA-256: d14732deaba1dec8b03818a550dd03071d162d05f5cc28cf24ff303ee6de4530
font_01_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 10744 bytes
SHA-256: 478eb1cde3cb1cd7b7109a66a86c2e37d3af19eee6df2a1abfac956d70319703
font_02_sfnt_off0001433f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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