Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e9eaf4157d44d3…

MALICIOUS

PDF

83.5 KB Created: 2021-08-19 13:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63b9cd0b173cd4dd2e28a0b492b7f57c SHA-1: d6c266ae4222b5ad47b015a36605fe72276cbc65 SHA-256: 26e9eaf4157d44d3d59cec329622f7f165091fcd53718c7465d0a98c4eafba09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities within the Formcraft plugin. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160735c7fc5404---zidimusojadibudupod.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072287c8383d---fogexasuv.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1b6cd5fab2136f338178ed5782d10326/15176639846.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc62183298---10103648496.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/86286550566.pdfIn PDF document text
    • http://delve-cr.com/uploads/jalutulinazexelez.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47651050284.pdfIn PDF document text
    • http://eva.am/files/a4ea4360a70f676c.pdfIn PDF document text
    • http://mlight.cz/archiv/file/31366653176.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/21936284132.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/onlij3ucun4u2k9m6j0hcpsg60/63247521828.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16202738485363.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/65824863026.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4dad49e45---gafekoda.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/vututivefomasutuva.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106060542584941.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3818f52d6552558543b1f848c3021dbe/37717826816.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/genepuvovu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/06efd4fc8566a2c5599449fe7a3b7b2c/pezeduvasujimufanifuzo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb091d491f---kekulifoxisavusojebu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b88a561e85592ba33b9561fd464fe554/bebugofor.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/72f8cd40e6682fe6654fcbf954a8be08/kikigusemisas.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078282d966b4---92956828301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=modelo+at%C3%B3mico+de+bohr+del+calcioPDF 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_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10636 bytes
SHA-256: 2ad3b397a3cbe9e62c89a77676515451c239b2870ca6f66f7ab5dd59925d22ee
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 17884 bytes
SHA-256: badf19851400f56ad1151b4de51c1dca61949f41ff03fad0ce4672d61e2a0876

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