Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18145c1703ae912…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 12:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93ae1a9757a8dc83b6806f8c741ed872 SHA-1: 0c40653ebacb5948c6d46f6755cf59a14440bcfc SHA-256: b18145c1703ae912991d5e579672e45c32aca001fa4dab8f26a37c76998455af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=the+dictator+torrent+magnet PDF link annotation
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/kujakawogosuberalefe.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/puwakomita.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/netaxuloke.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0kvmgq4onecfn0n9qcl22n2ca4/sezujafifobewowuzisusawi.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/18141184451.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/pebenevaruwi.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901091335.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/zataralodazajonozurajitu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/29e501038100f2914df7d3bc71d8d278/12922923427.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/38658573888.pdfIn PDF document text
    • http://gazetavk.ru/img/file/limig.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/84121325135.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rolokirimomenuranejopuguj.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/fivimafevogotigoru.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/notidezakenolefubisesum.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/rumoduvugiwuninedu.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/22725452625.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/72390880746.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6e8e2bfa---71994561054.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd5f550bc---83271886844.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/21501527630.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/72041217991.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/lotibobiredulesizobu.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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 15432 bytes
SHA-256: 49ab7d46011bb9fa145da2fe15c7a36c172ee27be4ee8531e628802bfb480545
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 10564 bytes
SHA-256: 91125b62a468699f3937f6b0ec887947d7669a917a0da4317c53c62d1f278e00
font_02_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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