Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ded119c92e3e55…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 14:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfd74b8c1510188cc5b05960b99dc401 SHA-1: 6f74828d9a2fc270cda4eb7bf7fb913c9637d1a9 SHA-256: 73ded119c92e3e55dabf5c4f2bfed3edc6d09239955b66fc4dd4370581187493
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate that the sample leverages compromised websites and link farms to host or distribute malicious content. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.hebrewforreadingcomprehension.com/content/kewagiramojupax.pdf In PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/27514582174.pdfIn PDF document text
    • http://goldmustang.com/files/files/pamekonewufedunisovi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a073e61290---42554318737.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/famedi.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/xigiviwazedaxazituromixaw.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/wojexakuxer.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/73320339019.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/turasatori.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/89275192029.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jejelegolufitizofemapita.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f86408fb4---xozaparikini.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/rakitaxobef.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/fupugadoladilatajifexu.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/fojagifewoli.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/njlbomqo7tcf9f8hitg4jbsdqk/vosudobozapivanu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3a7e22bd---bojerewaveriwovo.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/filofebu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/67244725577.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/suzizopero.pdfIn PDF document text
    • http://chayka-svg.ru/files/zuwaxawoturaru.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/muwevomam.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/wiropiseguz.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/81030584706.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/41142373304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=jatt+and+juliet+2+full+movie+hd+720p+downloadPDF 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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 18320 bytes
SHA-256: 178ca29ce1d984ad47b3540bdaf358f415e9e103dc0f27b306bec2c6cd87ea43
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 11160 bytes
SHA-256: 687def6110d9ed4022b6bc1a406f5bb7b7c7233690f1e4c6a0d8ad8ec2f4953e

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