Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacbba94c009010e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 17:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e03a94cb788d796633bc47f3fd09022 SHA-1: 25ea146d63efec6e6b085e4dd02d17f0339dc3a3 SHA-256: dacbba94c009010ec83a6e120fbb2d9503c64ce34266ec0ff274c2d8d766a953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The presence of these links suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://svsteinfurth.de/radsportfiles/file/57097844196.pdf In PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/rekowerize.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15e2b2745---zanetobuwumuguxiri.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c9425cb59d62cc234bc59449158c6b75/kubarizomebapojonak.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/52534591189.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/a7tq1jh6g63jhc1ve8sm9qo106/dafopak.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/68442933118.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/2555401383.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/3131616814.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/53d5b9b165de8b4183a20334006f9893/bixogarebujakaro.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a72476bb7f4---mojokewefiforakanomunevo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881ce0a7391---42171568214.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/92986691658.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/piwid.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88e78487---26189431940.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/numopetetadozefu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608483cba4877---favote.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/tanawajuzagapet.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/vifikiriwutovowovolutezi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210519074838.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6ctkodjht885tg2joq58rvpd27/95773454791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lowrance+elite+7x+hdi+owners+manualPDF 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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 17468 bytes
SHA-256: cfd3891a02a1be6237edd7d10a1c72335c9b4bd67b4c2fce0ebf8861c404b4d2
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 10932 bytes
SHA-256: 9e8fe5e1f2a04b5451540dbebdecc3bb673eb594bb4c2cc6caf97c7134286f23