Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1bfd9960c0149c…

MALICIOUS

PDF

196.7 KB Created: 2021-08-28 12:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ffaeec65a0efe534e14c6713b0f6a8d SHA-1: a6f28eb772b62a39576aef9f30e65530692f2127 SHA-256: 6b1bfd9960c0149ce2d1978b57bb277ecaeea39cddcb35100f044f338f1a496c
126 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 heuristics reveal it contains a link farm pointing to compromised WordPress upload storage, and an embedded URL that directs to a suspicious domain. The primary attack pattern involves luring the user to these external resources, likely for malware delivery or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=exploring+gender+diversity+in+the+ancient+world PDF link annotation
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d76ef4fb52db923ee39ffa61bd301805/podaxen.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/jewabujupadefidojevugafar.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/66451887783.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9d421119---4892360898.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/keluwuloro.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/78aff23fa7c289514c4c3e0f15a321f8/nomowerarajepana.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/xowofijetojexusuxapogo.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/af4caa2f7176c4a05e1e87ffd2d066ec/25799728701.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gunovidibowizuvalapu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/64994dc2qh4f23jjdo1fo9cs64/56777081395.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e9b99904---mukapedamoxugojobofele.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdabe09169---jebijiromiwod.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2jk1lati6cbm7oavd6uo5sd4po/digute.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50cbcb1538---vawenewevuk.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/50060174383.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/70168d4b78f8e2438a12b19146e86fc2/pigurobijogugo.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/2583587947.pdfIn PDF document text
    • https://interconformity.ro/images/file/moxutekimakapazimowita.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b26995d85e---45314378075.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/sominuwomiwukezoj.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/nigowo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd3a2ba8a---mezefa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/gmfurk4r3e84k25ss4fgaskecn/nibopu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/fekudofagifojevi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a091f2f40d9---rukixavodila.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_off0002997c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2997C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B18E 21732 bytes
SHA-256: aac05cb9bc4dd44bd9df4999fef8b596c3bf673038beedeb6365689f4a3176e1
font_02_sfnt_off0002e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E98D 11144 bytes
SHA-256: 45a2e607d2795d8c44a206688f424a98f6207b66580ba7ebbc7c67799b7fae4b

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