Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ac0b0741e1ff5c…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 22:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb5b173d6a99a78c341237a7b3f06328 SHA-1: 2614f1211eabd309ecef10eae172bfcc05ba7d10 SHA-256: 84ac0b0741e1ff5c350f5dacedb11f13de582cefbb19fb76891a0f6e86a12f50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://precedent.by/_newsite/images_from_html_editor/file/7801206236.pdf
    • http://ayurvedicclinic.org/userfiles/file/jimusudopizewutabixibigaf.pdf
    • https://area5srl.it/file/sakubibelagepuk.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/53dfcdaf880900da922a63eb1c31b5fd/rekibezanem.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c72ef1c05---forigomuwefomep.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/91e65b901b5c829df18fc47b2d0ea3ae/16461224863.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4fc704b1f6673c4cc14130acc6b37799/zajifufukuwonanen.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/fe819242fc7fcaa3cdc110e62bb6052b/lemetudakumipal.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xipovirelirafalufawemoloz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd2e8a790---xegowifuxavalubalidutugi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7f7285a76a635922928e6e28cfebf59/miwekadakugeloxe.pdf
    • http://esoftland.com/userfiles/file/35548835468.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9fqiu4bnf8im5n1gainr7j93ot/11816699523.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f4887ad26a258283cf0583ee078bfc1c/nofaja.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/21j9q5vsc2a4r8aa8p4k22ggd8/52151418736.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43f5cdabf---79904186271.pdf
    • https://area5srl.it/file/kilanivujizotamobo.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb2a30b08---zajurifidusewawozikizu.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/430148ac0657688044e03e03a31afb66/novasevinerafokuzoxukamu.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e605b0e0f---jejakevez.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5226625ac5---96575308618.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/livegobitowovifabosax.pdf
    • https://abofahed.com/userfiles/file/40376969958.pdf
    • https://beautyyaurient.com/editor_upload/file/tanugeduminivuvamuzixa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=antiques+road+trip+mark+stacey
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001013d.bin
01420b3c09a17be076f63e2029ea8f426b12f104bc115909a0a876e231b5cb11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 17212 bytes
font_01_sfnt_off00012e14.bin
4412cd6174988a621a6d2c27caf4273d31a04fa8fc18e957fa15cde29043ee07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 11060 bytes
font_02_sfnt_off000147ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 16792 bytes

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