Malicious PDF — malware analysis report

Static analysis result for SHA-256 956c3a50db153fc4…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 01:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cade55757f9cb21675b196375689032 SHA-1: 9906a04f5ef580eda9756458644a293b8df62e04 SHA-256: 956c3a50db153fc4caacc7fa52014615c892abdf26f0a09dca9a36dd9f63baec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and other disposable domains. The primary intent appears to be leading users to malicious content or phishing pages.

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 https://queure.ru/uplcv?utm_term=the+best+english+4+you
    • https://bdsvieclam.com/upload/files/95535646660.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d0552321---folotobuweratub.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b799lsdu010tvghcdkj9i8u1o5/59788679319.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ced060d9507---wapugigegosedurimu.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/e663aa2361d588154de908aa4624f9f9/gowijiju.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/xavenajovako.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/guqdhcrbgrfdvck2qvkr2natih/fobuxarubonenum.pdf
    • https://mollis.rs//files/20345780468.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tnab1ugg1i378a15vq814sbvu6/vepexedanem.pdf
    • https://xn--nmqu14inmf.com/upload/files/35512946437.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2744390a0e---96175361538.pdf
    • https://lecormier-menuiserie.com/www/upload/files/82307122352.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/28e78b03d9a2728677d1861059654fc3/11269730146.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9ddd7fd4---25096705474.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071e39bb388d---gixenogaj.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69d274da---31507530576.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0393c806ba39a0117ae85bd890a39071/zigumotejokitejejusejegeb.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082962f82e05---semigo.pdf
    • https://mumegram.com/userfiles/file/55797408865.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079825b2b690---buratudezobijorexowa.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2bd530bda---paderojo.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800a93acc8---mupabusigitim.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ac564e73dc3---midumipixazudixuviv.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996f7e9c1bd---tuboxejijenekamipuvoj.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c73084606b8f9b1512f29462d86376e4/wufedotanike.pdf
    • 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_off0000fa08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
font_01_sfnt_off0001121a.bin
847d3b0025b7578f5081bf767fae346858b1fd3656c65c0fdebb74ebafa1b672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 17016 bytes
font_02_sfnt_off00013e28.bin
b2a80f304e6619cb6b99bea28208cfadcb01ced0a5cdd148c4c4a5f42bef647a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 10520 bytes

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