Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e826cbbe015a16…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 12:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb7b302178288dc7648ac2cbb74854ec SHA-1: c3259cc15ae79bce5f2325e4cc519eb787e03120 SHA-256: 62e826cbbe015a16b6fa95c77d14886f5ea06cae1e4ae14c105ee6b6c4fa44db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://oniceh.ru/uplcv?utm_term=how+to+remove+mud+stains+from+jeans
    • http://polymer-optix.de/userfiles/file/9764569695.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e7ef2fda---pumozasisebalidal.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/tekosavovavivixugus.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/tuzes.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/55090837313.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ir5rabpnr5mtf4mp3si9j2jvpj/zajorexog.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c513e8b4e4c93c618b62a96b89579bc1/pixuxetidukaduputom.pdf
    • https://feng-shuiworld.com/userfiles/file/vakilubipajakuzubitilikul.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db52846ae---59738918105.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3e6e8826c3b972413289fad8407276c9/wixavelasa.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-28/20210628014955762564.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/m0cafpcv7hdn3d1okf61tc06qg/zusosapeliwukekazat.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab28b47714a---57942690940.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072021003553---rorovopurijobelimenobubol.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/42989717775.pdf
    • http://atomleasing.ru/media/File/22674925274.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/de35c8008ae8dd08857fc00967756fc1/xetepezusalaberudabujomok.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/41097789680.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aee792bf---47268753978.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0u0jvmnu13k888a6oh16sh25ts/27663762704.pdf
    • http://mgocsm.in/userfiles/file/vafobiru.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a097b6394a9---36668945649.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa394b0b0b---93023500303.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d987773572---zopagudowavibofo.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/908f32cba84ddc4d9a5c63867c029219/zoxabupezozaxokijetoron.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4016f0623f65ecbbefe4eff8b35fb091/wewuzewinitozobezomo.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7c72de47---sebomotomobagek.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_off0001013f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 16792 bytes
font_01_sfnt_off00011951.bin
6790dc9c96089af6f3c593d6411e0fe13fb2f64188c9dbe758a01cc2e6bb17be
pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 17076 bytes
font_02_sfnt_off000145cd.bin
8aef11203a4d979025876b7cbac06890e603b58c45c83e0458240c66fd70ea46
pdf-font-stream PDF embedded font (sfnt) at offset 0x145CD 10844 bytes