Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3438526278ae186…

MALICIOUS

PDF

86.7 KB Created: 2021-08-11 07:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bc8e90c3c78f06814403cdba7fbe2ae SHA-1: bfc61e3609a9dd3b8a4183b219273feb91740ed0 SHA-256: f3438526278ae1860f491006e6d3968f6f424293ffe3b461d2bdf9dbfaa63942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. These URLs are likely used to redirect users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=asme+boiler+and+pressure+vessel+code+section+i PDF link annotation
    • http://bright-mineral.com/uploadfile/file/2021072302495898.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2e05bad1---nojeluge.pdfIn PDF document text
    • https://dietmoitangoc68.com/upload/files/12271956842.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ohec0bp6ulq6uq8cn38ge2n51/76459302492.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/tonutepu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7abbc76e3---48757278588.pdfIn PDF document text
    • http://artospace.com/pics/file/98542986540.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/88708290740.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/wasilijegudilasijetovelo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/30185614065.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/86435139187.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a9a07238---mojejowusuwuxugo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/23115917087.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/43066791603.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b334f8e45ac---14806561610.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d12c21df0e---kiburofexo.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/94341447003.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6734b73b5d---nakurujadevewupirigemi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0a64f3d4---vuniso.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/90501502589.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/58426065938.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a374558a5---mowojudenubatirefawuk.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/72s2h48rm94p249uo5f871venq/sidudex.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d237046d4f---79962522047.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/jeniferilolesitav.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 10960 bytes
SHA-256: 8c58b423705106fb0df4c4366e40f667545e50f96e35a891e1995db330d6eb84
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 17308 bytes
SHA-256: 766adfe75eac2615c19a4ff1b38d9adf197342bfa4a5987c43e07b37f5219d27
font_02_sfnt_off00013446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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