Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d0bf3f8d62508d…

MALICIOUS

PDF

90.7 KB Created: 2021-09-04 07:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa4aabc8010dcd35a0bded95496374e9 SHA-1: 894f38c15f72649ecc3226d5226f3ee957b7d2e0 SHA-256: 66d0bf3f8d62508d945a32d2d938eaeeab73648ea7cff962bb5736d5f3304975
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of multiple external links suggests a downloader or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://h-st.nl/bestanden/files/tedumerogekedimitaz.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a94d7da69d---72664099502.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/fetafuzozedadodeje.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/88820072624.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/54636e9d285db2561dca04ce472149a1/vufabavusefilolajebelesa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f76e97fc---wilaxekerewuvogojuna.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9375aa5ab8---wedotutiw.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/53701628564.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df101a910b8---pexexodunisukabakupabir.pdfIn PDF document text
    • http://trivio.it/userfiles/files/61013181614.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/29809817548.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/sedaxodowevoxi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161259b4d885da---tuverinoralebidusere.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/48856231842.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/wibetuxilawapunulor.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kijukokex.pdfIn PDF document text
    • https://esz.jp/img/editor/files/14916322444.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799a675ba3b---xugabepoxiruw.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/gapigajajisixerudibumu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6b4a595d---digafilerawiri.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/sesatedilebisexevif.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/96087065924.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/07s0t5ld7k5b9g07107njj5515/35851982005.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/21183787928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=thinking+language+and+intelligence+psychology+pdfPDF 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_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 17628 bytes
SHA-256: cd63fbb1f76d576f26ee7a3f51f3289d5602c0a9f229fc3426145429599fce2c
font_01_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 11068 bytes
SHA-256: 904c59cf5e90c8676b982a2d778edaf15e1d4ef81f1a05173e141b90e64ba0cb
font_02_sfnt_off00014487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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