Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee1a596ab9bbcdf…

MALICIOUS

PDF

79.1 KB Created: 2021-09-30 13:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: feced4c59944cdd7b187086b9031bfe0 SHA-1: bdb7342c8ada0807907eece18eada994cf8d7cba SHA-256: 6ee1a596ab9bbcdfc84b1d7bc37c9a8884e8235292a4bf6fc3f9d197ccc6ac53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=netzwerk+a1+2+l%C3%B6sungen+kursbuch PDF link annotation
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/jimatojizer.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jejivavunajuna.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zivagozepedumim.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/49237235866.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/87227338461.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/le98ieknoed4ulfpbb512dcjl1/48317671208.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98181885900.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/58526150562.pdfIn PDF document text
    • https://jotelek.hu/files/file/67694475994.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/52023454738.pdfIn PDF document text
    • http://muratay.nl/userfiles/file/95624948553.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/50b9abdd0517c9dd258e5a9e8d8e87f6/palodazowejuvo.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/gunimevuxo.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xipojafivopomujisaxapak.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/9892414813.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/53348134819.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/83808978170.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a1d95338---43457433293.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/lixoxat.pdfIn PDF document text
    • https://congchung7.vn/upload/file/12346831726.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86211452454.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/75355354256.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/vanopiwufijis.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/zurowosonaxemo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 21172 bytes
SHA-256: 31e126604823df087897c914f9607a70070f843120734224eb2117b0fa1160cb
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 11136 bytes
SHA-256: b8915bf809e1f3af9d6f2a36d0b2a50f7675b2fe0e7ae71bb93045ed567daab3
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1