Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f34e74350a3418d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 08:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee026088c2e8ba3fdd8f7f6523966cbe SHA-1: 168dbe829650d041a84b02125101a111aac184a4 SHA-256: 9f34e74350a3418d014131090c163f2a8da1ba7c57225e8fe5ebe0cb161a61b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristic firings indicating it's a phishing trojan. The embedded JavaScript stream and numerous URLs, including those hosted on compromised CMS uploads and disposable hosting, suggest an attempt to redirect the user to malicious content. The primary purpose appears to be facilitating phishing attacks or malware delivery through these redirects.

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 http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/41636314897.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a3b58faba17c5d26c10eaa066c9a74ee/66199627323.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/kowekuvoma.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/pesikil.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/40007592160.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/17479697958.pdfIn PDF document text
    • https://baptistfriends.org/media/2295256705.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/22744328420.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ffdbb6b9a---xumewewififegemelifabofav.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/30361682954.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142520ab8fab---tabewifav.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161480107e66f7---66979752858.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/72151173828.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/83885674848.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/zekijolawefaxanij.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecc87794df---fedelubonumim.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/12900765436.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/vodupuxawaporufiru.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/28355196616.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/14905028485.pdfIn PDF document text
    • http://24cvety.ru/upload/files/zubufulalukoneliwuv.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/71085974408.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/defakegaxoxoxeno.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/tikotakitegepesitodesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gangstar+vegas+mafia+mod+apkPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19307213512.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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 10992 bytes
SHA-256: 7529deda6df4c08cbdbf8c1c768cb700b2f16779787c68552c2f44d2ae608b40
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 17268 bytes
SHA-256: 482f91dde476b28b7a303b52f22cd01fd2c58d0e898319c7bf21cdd5656f0027
font_02_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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