Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92daf393c9f048f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 13:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c1a31b979066d4c3b47e5883787d545 SHA-1: a5b78b37942180c790f2d420e7d64c481a74543d SHA-256: b92daf393c9f048f6ef3722933f6e68f06b614e8354431b727ed04c5cabc2886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of luring users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=basic+rules+of+derivatives+pdf PDF link annotation
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608001fd25140---miwagumivotosurog.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/56952043824.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nmbs78g2sgnlbu4v40aifcqgnk/26051355707.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/41241213504.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2c530fcbce9dee9ff49ec065083e351a/xenedenoboxafebozin.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kevafaravujagexibezabez.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/81590801356.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/52136885087.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c5f3cda---16184172309.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161255f90de6d5---42742202439.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc155f27e3---fagine.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///67719740435.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a24794e263d01f90b2b2f07f7795cef5/15237716820.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/jizovodokedukupusowasij.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/34868776189.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1rmtd3aa2lcej6dcotbcoh6985/muwuwowejekuvodije.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5c114925---31207497428.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/vopigabozazadidipoki.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/84724260279.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0eb02a3be07211a1515afbce3dc35c3e/25091180145.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9dbe36c458ae96ff8a32e6128754b01b/vexorexopefuderafuxejini.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sm3mpcp9e96i1ge0ci6ot652ge/nuwitejunaxopu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5417a7d541---zemojuwumurimasebilebew.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/lanigokolon.pdfIn PDF document text
    • 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_off0000b4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C8 14720 bytes
SHA-256: a4ed640f01783d6845dfec8dfd4e099f987b859d9a74dca47e4f31ed9d42c5fd
font_01_sfnt_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 10728 bytes
SHA-256: d8c4909c96445b64aba829d08762436264769cc4a3a63fb2a3340c3857a82a34

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