Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f4b38beae44e4c…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 21:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 617e1014c467d2d65a09d398dd118b97 SHA-1: 944ddbbf553100c112ea0f6db81013334243ea9e SHA-256: 41f4b38beae44e4c39d46efe8c503cdd0150e05a1b0647c83bf28cabeefa26cd
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting. These links are likely intended to lure users into phishing scams or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://binarbaidtrading.com/public_html/userfiles/file/70901696256.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d05257f9---rikibeselolibolulije.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5l017msjv2kvs2q2ihedsd9qmf/2203079801.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b63e2bd0ec---51537901092.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcd9c254e---lupoxosazurosu.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/238hctom0j60ur6diip905p6nq/49315421551.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b0b5567baa159074019b7d3e4cbdf195/xoxanuvudamujodefe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5fa4e6077aa82d292a60caceb375ab18/vupinidemejeg.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/82442222491.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jonixibavoka.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/03de622f7ed13637623c1c053bad7a69/verawekofeximajuxexuj.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/wisusisumedukozimim.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba1b63939---guxexuve.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a142f3aeaa---93071355917.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zemobupepetofu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/nakufufuvugake.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/26087868890.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b29a09b1b---35045899418.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094e78a7922d---ferirufuzu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8e464b80---88433255171.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/52f51e306aaa54e2b9fea6f04c2f4e72/wemojofinukadadekuvunux.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c34d5496---33265458798.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ff1177a6ccb0079dd627f6f4997b5042/62971304458.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ba47b677---bukuzaxuviwinovu.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/533537877c64ea41fb9486f4c6101f6f/23223096945.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9e4e275a9179e28977137bac1be24643/fovejoluxutijevuxufokume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=10th+ssc+science+1+solutionsPDF link annotation
    • 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_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16744 bytes
SHA-256: 9d1bdd964fdf342886909c5c18961123b5175d1644e8b901cd6012819019cfa7
font_01_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 10244 bytes
SHA-256: e52e734c0929254e01b3ce47f3fdb4952c098a37596a6377546df99e34d457fd
font_02_sfnt_off00014948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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