Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6413d64358586ca…

MALICIOUS

PDF

70.4 KB Created: 2021-05-23 05:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5ac6bb2f96e5cc0084595315fb8af5e6 SHA-1: f7d5f3e82b3ed729857f2e03685de238988335e1 SHA-256: c6413d64358586ca2aefe3979ae56f9c25898abd1bfb6e3ee4b104a3b2d50d4a
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to websites that appear to be hosted on compromised WordPress installations. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/3lv0te6ikf8u1kk35pgs6ui9l4/10585138089.pdf In PDF document text
    • http://aweibel.com/Photo/file/kugigozetiribut.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/83521981200.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca7c82731---tudosagakigaketaxujiritun.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f5444878bf6a43ca92c1b681a66f560e/rosixepefi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/515e5d372bfd8b617eacebbbe389c5af/43671391892.pdfIn PDF document text
    • https://t2sc.me/userfiles/64657341161.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/vofanusog.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/jurobosuvam.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/muxikadipuro.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c2149dbd67a6c7fba3f6742c2ea9890c/61931163890.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/786a46076e1ff130aa1706d43e1f433b/26062650328.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5845e8e7a---76703617868.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021529332185.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c3aa162465a52fca9c3231d721bd084f/jituliwubuxebiwisa.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/28545958290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lite+brite+cube+patterns+printablePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 5008 bytes
SHA-256: dda0446922fd396918b9bc5ac68708259ac95bb4ba3c4b68e5dee448a50cd800
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 9620 bytes
SHA-256: 03b26990997ce7d30c35058135fafb7271701213d92fa9f6358cbf39d11e63df

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