Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff9d282cbc642b0…

MALICIOUS

PDF

84.8 KB Created: 2021-07-22 17:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f1d689b5951f0b04a1327f75efbe373 SHA-1: 7df4aa5a4b0cfdf94ef88b00f1c21f1316dc809b SHA-256: 6ff9d282cbc642b06e30c2e2ff653858d749e15699e4070e1ba3cb49c9922c82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to facilitate initial access via spearphishing, likely leading to further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rmduncanrealty.com/userfiles/files/wobadafejorikivivuk.pdf
    • https://sy-tech.eu/file/61534826785.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55492748108.pdf
    • http://mim2010.ru/userfiles/file/12319404249.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8c918b81c503e76d7c98052f17f1795b/vufotisarizu.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6fd73afc93d4487b9f0b2ab3348c8746/67914599947.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac7aa43090---basotigusofiwiduditubakag.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/37r773b7i8or73amoshq7ol1ls/diduborapu.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e1c02e2c6---11676330712.pdf
    • https://intellicapital.in/ckfinder/userfiles/files/22215250120.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28798d36f---savewenurovediduvagax.pdf
    • https://gamma-electronics-eg.com/userfiles/files/36597503044.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/q9es8nck3vh6d4h6gr9v6sprv0/34807293306.pdf
    • http://immobilieninvestors.de/userfiles/file/6043565792.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9be95db1---38923421527.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rpm2ar4gophl4uu4b0pkil4t30/80631198159.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0abrj0h1ag8p86al2qi8bggmr4/kifafiwoweredalamuzuban.pdf
    • http://oasis-inwaste.asia/files/file/rovapelalijodogeri.pdf
    • http://bandenplaats.nl/cmsimages/file/wodaguj.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/gefevudibabogifila.pdf
    • http://j-club.eu/userfiles/file/55410341126.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a081bfd26---mamukufi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=black+and+white+crane+fly
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e886.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 16792 bytes
font_01_sfnt_off0001009d.bin
b005ce5aec365b912af331a4a32e780fa0ff6b1dcdb323132f7bfdd8e96165cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10628 bytes
font_02_sfnt_off000118ee.bin
023712eb270d7cacb0a8a787134f6d99e9567ce0a0269aa9a225eed9468791f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 16544 bytes