Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f305547ba231afa…

MALICIOUS

PDF

90.7 KB Created: 2021-07-15 20:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8c37c28150e5fdfbd8eb20eb7128226 SHA-1: fa0fe9c077180e21f86fe576149d55cb92056576 SHA-256: 6f305547ba231afabbac5dc3a02be29ec43a008b062e980c2281cb35d2918af3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://laborke.ru/uplcv?utm_term=miniature+cows+for+sale+near+me PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955c766db72---71388196805.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b2673fc4---gasusame.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/578005ed7d27edf8a891caff59b789d5/13328529189.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/62ead659fa24ad113f65e4fc5b0a8918/dibesoduzadatezakol.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1f0d41e9---98945003580.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/27278205716.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/nagefuligimabetanumabevar.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/jifomobodetupekufisupi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086e39e8c54f---61334844166.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d112959b9a1d008ba6d19ecb549c9217/bijabutekar.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/de4oenabu2kcc9g92k707qnh3l/65672415406.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607941618275d---92522812024.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/20635281735.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/xanunikexo.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/fudumutag.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/diziwosolojale.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/sawije.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c77d058d1a---43177777524.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/gazuwofexikezavokadakudot.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3108c21e1c8e7a465e813de4f4ffee30/pikolubu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a604f88db30---divovedadevaduve.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/93710708586.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 10676 bytes
SHA-256: 43dc74677bce7e3a2f8b5004be8425ac2d87b288e252f69834a6af298368b275
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 17868 bytes
SHA-256: 76c16e2ce3f9a5f3b6431fcf120c846d11c483a4b11912ebd494a1af12269c53

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