Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fe1185603776fa…

MALICIOUS

PDF

85.5 KB Created: 2021-08-02 21:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d3ad274aba9d6adf30b60ea9d444652 SHA-1: e21fa5607655f6b0b977647025b6e9bcaa9c4696 SHA-256: 27fe1185603776fa2d79113570c82afe9777f6de9e19259540ecab32fe39a5f4
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, with many embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5bc17e20---viwugomajirigatigij.pdf In PDF document text
    • https://audreyheselmans.com/_files/file/16759882038.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e26391cbb5c---37010626479.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160736a87ca1dc---2314802767.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fe59bf21d898d545120db05a25422fd0/12144585141.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/88639040473.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d2a0ce6b---sajozezalo.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/tolokivemanufoz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/68e1778d3bb7c17094fe3b3a0aea618f/7370338941.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dbb2097e---teponofibedatonuju.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/63140872161.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i6lur47tjepb46ehgprqeu732n/98512827021.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/dhtppfd5om55536k79thrgqn0r/12033954607.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/gickel2vruj9ljd2pnjudd24k3/71849625547.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/gokatuxezup.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/fomevukeserozegosofazopix.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e55102db6b3---kedizedarelefagizorizo.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/zugigawelabumemidu.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/67081787714.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/xumatojaxaxegukibe.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608428030dc9a---41510727707.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a60da706---5582399914.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e2308d1dda8bd6d9b4c38a4785a50865/latuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+jcr+impact+factorPDF 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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 17180 bytes
SHA-256: afd9d40fec7e9497373ebf2069a0d5e772b30f9c57ed43104dd6e77914826938
font_01_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 10644 bytes
SHA-256: 81c09af6aa0705ec394ba25b04fc3d91f29c9511a6a5d8b844df155a7644f630
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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