Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edfcdea11eb7b8b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 05:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b4cba7ac9310bb9090fea6cfb9bcfb4 SHA-1: f090a7dc258ad8e7e1c90c0009a8ce9399676093 SHA-256: 5edfcdea11eb7b8bf2a5287a9c2fbf6d4f9a3254443e1fa6c53341c9643439c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d91b37358---43626246932.pdf In PDF document text
    • http://yaeram.com/userData/board/file/44104475698.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/63896835718.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b4d659babe4d8ced68a82f17995f5a5d/ruparib.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/gonusevekakidixir.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a039694930d---21878563212.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/84724571515.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/nosigib.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/40866905162.pdfIn PDF document text
    • http://kaies.cn/upfiles/210703131618041343hjdj4i.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/74112690328.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/6316436135e6d6bc61bb4861e6a0ea13/motifivegijabedekaw.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/senegoja.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/051vb2mv2fa19tr3rlsrncti8b/8741914756.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/95479384271.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/vedaxanajaxo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86b72f650---41033874454.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/zitekuguzifapekigov.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff0367142---xodevilusurivukula.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/pofebotakeseminepapi.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/xowawedevukosobus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=jadwal+piala+dunia+2018+di+rusia+pdfPDF 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_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 10820 bytes
SHA-256: dde177a793f76ceb8a98b1e48c98998d1771ae0c3a8ac4d67db49f6074cf0a0f
font_02_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 15956 bytes
SHA-256: 7c5ba2efa726274525e13384d041ce23f1b48fdc32ab9316cadb6730e56d86f3

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