Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f37febb182526b5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 02:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6520396187b2474b54f3c1dcbf6d5fac SHA-1: 65453cc5e4393acdc0a46aad7cdddaffe784cfaf SHA-256: 3f37febb182526b5a3cf936e8c871cf1b873af52e63b504fce31a5c3c26caa5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. Although no scripts were explicitly extracted, the nature of the links and the detection indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b061452f48c---45800947889.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c3fb0d4521331cb75c13d0130519d8c3/11630754975.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1c1e0c596---womagiwifumubeloxun.pdfIn PDF document text
    • http://iviltra.lt/images/files/gigekijisijiperizekuviwi.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/paditozaxudogexotuvofakaf.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gipafewexosenuperup.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/difovoputozarefewarutaf.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/23740809669.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/83758275025.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/96213042324.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/tuwufo.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/48987611986.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/40600159482.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/gefowuvaluvak.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810a5f1a2dd---96777278841.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/41088023589.pdfIn PDF document text
    • http://domainecomps.com/documents/files/xoneruridurota.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/34968946728.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/87171306346.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ffafc63e881a4020dbda1676c01ec52b/32511154334.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/81705639367.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/dosopit.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/94588887047.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/lemunene.pdfIn PDF document text
    • http://asfalon.com/__files/file/44718834377.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/84621640542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+a+notice+period+when+applying+for+a+jobPDF 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_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 18556 bytes
SHA-256: cd530129ae1eb789b02c48dd7737d68c90efab4e080a33bbd23504eba13c64ea
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 11364 bytes
SHA-256: f7dd8e4bbda24b44c95de7ab4ccbc4d4c73a0068472292b2cdb3999443f2bd56
font_02_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1