Malicious PDF — malware analysis report

Static analysis result for SHA-256 719ebd87b3c8fd55…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 05:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8590011ce301fdbefd21c5782b268ba4 SHA-1: 4e44243249598ae241b119fd8ec1bc6b1765f796 SHA-256: 719ebd87b3c8fd555099fec55c611101b8b5a90a8632695da0c39b71298f4ba4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=no+1+game+in+india+2019 PDF link annotation
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xinipijexazaz.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/78758112897.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xajegejajatil.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/pisugepetomubidawupi.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/budiridoxuzuzeguk.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/finudutij.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/goferejisafadidafujuv.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/reruritili.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/rebotiziruzeta.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4d8d514cbc3ecdfa392988d103948146/bopovozemijo.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109021133276376.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312a8eca450---79259230445.pdfIn PDF document text
    • http://usateatop.com/_upload/files/bolibejibejizisosudovu.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/tezirodepinuzolikavi.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/piradofojipadugaludo.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/32130792005.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/lojubalenuwu.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210918002455.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/modatapa.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/revarokawawinogakamejigef.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/53685094718.pdfIn PDF document text
    • http://placc.info/up_image/xiwus.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da505185d---9501115467.pdfIn PDF document text
    • https://mimpidia.com/contents/files/68592481025.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 10616 bytes
SHA-256: a0782d825147a84a20b9b6b04ae2d301dc824ceeaf08c4ea692f43850e54b656
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 18008 bytes
SHA-256: 15c8574715f92b7c6d5e54d61202293d485d859a7271da0a58c8e34dadd798fc
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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