Malicious PDF — malware analysis report

Static analysis result for SHA-256 075bb4c74fe84e5a…

MALICIOUS

PDF

94.3 KB Created: 2021-08-05 03:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52d596b087c324ef5674619ebb33c077 SHA-1: c48ec5b54a72edb1ac82827c0d8481f404d5c2f1 SHA-256: 075bb4c74fe84e5a02ca0c0a9a47a959597dbe11d253c0621b3abb2bfb300871
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to redirect users to malicious content. The document body is obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=sora+no+otoshimono+eternal+my+master+ending+explained PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/r08ok1ab3e6leld3d54aobgvvs/xovotusafal.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/62498682836.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/82881773910.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/wupibexovakexakusexi.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/95052259010.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/timidorojaropudoxeraxepe.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gedklbak2p0jhvfc5tccdipfia/debawanepaxopomipuzeb.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/13488510017.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/latuxizikelofunis.pdfIn PDF document text
    • http://huiking.cn/uploads/file/301954127195.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6d3b10e3---26116075766.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/2998335236.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e48d56120---sefadofidugasipipo.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/wimix.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/70497395099.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f161a2006bf---nafuredere.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f926a40752---mevuvotumafanebuvovateka.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ttli76bbm4nk1rr6ldc0e65ul0/ditonijegorosozepil.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/88721172586.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/351402cf25741987c9380422ff4553a5/dozunemupijokepenedigega.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8e841bde---paxuzuzegulusutujopegi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5bdafca937821d5d60d489bf7569fabc/6051946715.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/87893680992.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/r1slqnhdm6j9ssrn1mirdpoq87/73094035806.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 11128 bytes
SHA-256: 8d17f67a1c3373e76ce265356bfb596c6042d449b63d8d00dca418faff9ebce9
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 17520 bytes
SHA-256: 7884d0c24b9d6e8228dfd947d0392c968190614e8e1fda37c19c763766af0747
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 12232 bytes
SHA-256: a24f6eb888fa689d5af75b427020408de10305568334ac78893ab45eaff0ddac
font_03_sfnt_off0001515c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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