Malicious PDF — malware analysis report

Static analysis result for SHA-256 a663285cfe03c138…

MALICIOUS

PDF

100.7 KB Created: 2021-07-02 20:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8ccb4ac63d1fcebf7d17bca2141e82e5 SHA-1: a35157c2da5f1b4bd5932ae572d6dc936631a8d1 SHA-256: a663285cfe03c138fd629dbfb6da9acac32b7c22edec1c694307f8a8523b222b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f5ea5518f1af0503146ef06726b365be/8396090355.pdf In PDF document text
    • http://banghetretunhien.com/media/ftp/file/18278700487.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/h26hiuckvq6em9r7uiud67jgp1/siremolifarolevevuwetar.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9aad49f2---93814679053.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1623196152pajizozilixutela.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094308e1b958---91985527546.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c93e51634---72630577780.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/35c70f83384d0b73a5cea3dc3d93a00d/weripujuzodilad.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff21f16104---67815382089.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608878a932e40---84183972124.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/wopokosakozagi.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/68536912796.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b120a42121c---betawebonezut.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9360d02bbe---rufamipasunimijakaduva.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/83f7560a27c526e9df9f27f750e2c158/61647116804.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c54c59ce2---zigozamowabotekodiwa.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/21029665045.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abdffafcf3---16838111461.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/tijudixuta.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c0d48700---75766739403.pdfIn PDF document text
    • https://estoniapools.com/contents//files/gifog.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/sifetagiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=non+volatile+meaning+in+kannadaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000124f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124F2 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 10456 bytes
SHA-256: 62090e1c4053caad7d25374c6c8fe67e45941d9f1e1a79f1b2ad15496b67c0ce
font_04_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 26116 bytes
SHA-256: 98837de501e52276710d1de8bbbbab3f9f556e9084d7bfc9818f6948407c7b95

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