Malicious PDF — malware analysis report

Static analysis result for SHA-256 35400d882cac8ee4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 15:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c1ecb7c0b2d05e72782d04be0d348bd SHA-1: fa080d93ac6d3bbd144736fe8edfa1c63c29b860 SHA-256: 35400d882cac8ee4de547e6fa15632122bb3acd36e6fe2faa3cccfc5965b645b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=upper+intermediate+student+book+answer+key+pdf PDF link annotation
    • http://escuelasfutbol8.com/docs/files/komizutavolibonefawide.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/kotedi.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/vuxogevaresezulalim.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905183013.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/11717805023.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/sobuxaxamosanin.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/ditezekeluko.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/wonuwu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/14388929120.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/farekine.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/lokasife.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/87628225642.pdfIn PDF document text
    • http://panova-art.com/files/file/75025260858.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2451028805aaddf27f97e98dcdc6ff1f/24837976197.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/18844542389.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/kaxotedaluvuzazile.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60d79483---lojiw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fc25a271---ruzawegosidodaxar.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/xomifameru.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/vegapimugabexoxerefuw.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/7770027052.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbe505d5b---18695050439.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/majawakisifabexexokux.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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 16888 bytes
SHA-256: c238bd1b8cd35a43e69d989a7022297eb79efa8c812a189351d3543cf3b10d7e
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 11152 bytes
SHA-256: b158d7e14ec4b134abbb2b16b16f0817d5fe6e11c6d8fe8c6f7ac448393e0b24

Open this report in the interactive analyzer, or submit your own file for analysis.