Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f732203be3680c…

MALICIOUS

PDF

84.2 KB Created: 2021-08-05 18:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6238b9a254cb6cef477f238b463dae0 SHA-1: b993cfd3f7c3241233f9651de16fc0bc75154555 SHA-256: 37f732203be3680ca750fbc461c96c17a61f466fb0fa2da205788bb7744aed6b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious websites for phishing or further compromise. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://abnicum.com/files/file/mufuxotirozexesanidisino.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa2e59dcc9---dawikuragi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac8nbqe2pvgm10487ilg4271k1/pekudovinefiruzo.pdfIn PDF document text
    • http://promador.pl/userfiles/file/53396660938.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf149b396c6---defarakukirosazebomakane.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/jijudizif.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858399e2b1b---48981145971.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174bc7b3bb---sutenerasagudexurakaj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f82trfgfpet50p90b0n0p96dg1/garazi.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f5ffce3d6b71c0168cda4c7ded473476/60728782402.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/74682000991.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/92208856919.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c3788a53---92422521605.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/34213447869.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/woxezowirivafizefogoge.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3a1b75c1---supegipasaganimewiraregi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b9d1929ed63e90bc8bf5fdd99985b8cf/19205110880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gram+to+teaspoon+conversion+butterPDF 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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 10832 bytes
SHA-256: 7f6c0d9455757f31576aa2e2f28c2b88b14deb73bf1012055f497a2935829679
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 16988 bytes
SHA-256: 6e24b26c31024d01d73f99bb30e90b337b7baf3d71eac0056afe1aa0a12c168f
font_02_sfnt_off00012b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1