Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0370f27f5e3b84…

MALICIOUS

PDF

79.0 KB Created: 2021-06-26 21:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 946b85ae9d92d92f119c9ce4548bb3b1 SHA-1: e1b2e28a47f030b7b05ff1da0bcf211cffef4003 SHA-256: ba0370f27f5e3b844a05f7d6aa3115353007c9b8eab2d7bab83611575a52e3f3
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=how+to+battle+your+friends+in+monster+legends
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/882eae51739270dff8d142d03782d2c4/saxexonebepesipowosuxeso.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aa3ae8202c4fc7a8d533ac59306bdc67/fitifoweta.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770bb47b425---jaregesukowonotofomuz.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/is38ae30uc7f8tabi8qarmks8b/kopagumamumutalugesovem.pdf
    • https://universal4shipping.net/userfiles/file/36790408404.pdf
    • https://4appsoftware.it/file/bidilogedilodasi.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ab3d94c7b---nakoxur.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c021829b6---sulopedazidirawikulov.pdf
    • http://chnli.tw/CKEdit/upload/files/28192744532.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u4ef0rdegn6ea7vamb75lg38l3/wupikawegine.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d928b624---koguduta.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087d331a3724---41153130815.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d8f747e042870570e1804716be9b73b1/xujok.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ad378d95---13232703236.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092f5e69db75---vuwilofokosez.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094daf573c25---jexigerogolesafoxowi.pdf
    • http://szao-spb.ru/images/news/file/dirugutagaxorukuze.pdf
    • http://agataklimowska.pl/userfiles/file/1330706960.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad221b62af8---59839545731.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/05q7p7kthqbdgecdq3io8q402a/wegutamu.pdf
    • https://diedacorporation.net/freesiafiles/file/wodagusikanarixul.pdf
    • http://dajuicebarus.com/uploads/files/91050691679.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/35865822344.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9b2b8428---55400251874.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a84d21bcd9472ae303a72d3af917067/fodazadajufala.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_off0000cf4d.bin
64f42db86791bff787746df45beb7964c10ffe6cd0d0d2c21b965a9671a7aa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 11128 bytes
font_01_sfnt_off0000e917.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 16792 bytes
font_02_sfnt_off00010129.bin
d3a4d3111aa7259b4b61745b991f6b543110f3d06878877cc98f8ec5dfeaf13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 17808 bytes

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