Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c3cfcf023cf29c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 07:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1daa9cee6510139e01ac68d6636f6dda SHA-1: fc65a64f128222be6fc4998c59f3f26c7c09c439 SHA-256: a9c3cfcf023cf29c33c7d2f65ef8398dc13a5a05ee7ed44332dfd4f72a8d7dd8
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. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://bertrandetgastineaudesigners.fr/userfiles/file/vevegopad.pdf In PDF document text
    • http://planet-for-events.de/userfiles/file/70263733834.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/15909882620.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/xotigidepibigipav.pdfIn PDF document text
    • https://vestol.bg/files/file/jakafetumipuxibodo.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/3793220518.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1daf01b885502a80660ec998e0b2b1ef/benivorik.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/lisowimutulixumexi.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/jikixibarogobivi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aed1763c2---1356748536.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2u6l38c6nlq4vhjbvd5ivjn1i2/gusuropalejanifekadib.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/taxuxupa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/26856917034.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/66746108054.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjhj63h3pqh9d5m0h16fn2iqrh/26520074974.pdfIn PDF document text
    • https://partnermind.cz/images/files/48384563687.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/12046742118.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2eaca4034cfa89c24f33394ac2c23163/40726308338.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6m50sjiq20as1avtdd2jelsms0/219818881.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b02291ca9---bevonasixokasesazekez.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/45373281383.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e034ecff---54591816508.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/tatiripuxax.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p0sp9rogva4clodp0ft0kaev6c/wegasotenudijofiluturobul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=impact+objectives+prPDF 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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 10672 bytes
SHA-256: 307468a60dfff015e86e4ffe61b373f0f0ad760e90bf13e33abfab996d18106b
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 17344 bytes
SHA-256: b12c27f914e1259f2cd31499c7c4198991a1f31dc4eb8ef484058330e74329d4
font_02_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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