Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca9f1e72ce43e8a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 08:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78400213d39928cca1815323468a1536 SHA-1: 5f4259acdf429390afc9e1600c92cd56a1dad7ee SHA-256: 1ca9f1e72ce43e8ab186b442ddfe802ad430284af41d05136e20073bc82f99cf
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to unknown or potentially compromised domains. Heuristics indicate this is a link farm, likely intended to lure users to malicious content or for SEO poisoning. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

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 http://interreg-ipa-husrb.com/downloads/wotitivemuxos.pdf In PDF document text
    • http://montesantangelo.it/files/files/70566487525.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/jajuso.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/34322521041.pdfIn PDF document text
    • https://bloc-immo.com/images/wutumokid.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cf328a4ebaa63bbacab745f46eeb4ccc/redigiseju.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/2466810432.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075842fda---92642207976.pdfIn PDF document text
    • https://tepihtrava.rs/files/gemimole.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/10796119235.pdfIn PDF document text
    • http://ccshecea.org/upload/files/meganasokedufusunil.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/45637009292.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/45446477473.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/gaxonibozenukogoworaf.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456544f15e8---sizugatuzaxerorurasaz.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/27623075404.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nj9fnfvaevtdf1p7hosleh2c6f/jelujubububasomegu.pdfIn PDF document text
    • http://modern-pro.ru/files/file/70744149693.pdfIn PDF document text
    • https://istanajp.net/contents/files/bipodaposakerufasuf.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/jilojupekowimolixiza.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2thcukhjqlv9sui0f3p3ui5718/vaginidevitosuvitugilag.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/84391199011.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/24002373813.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/redinigofapumujes.pdfIn PDF document text
    • http://erdbau-rauch.at/nedotagozumoxuboxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=les+giblin+pdfPDF 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_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 18492 bytes
SHA-256: 3f08b037a15cef643d096f8d4247a8dbb5204e44000901c809a44a6af312bb72
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10288 bytes
SHA-256: 28e7d657785fcbfc774216d7c3367e4c18dfa13f051b3844fc474a2f044fce57
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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