Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f66e470a72e22…

MALICIOUS

PDF

129.2 KB Created: 2021-06-30 14:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3537d825dd01253457ccaf8d72a73243 SHA-1: 1ff72a7930d82bff8b22a75b7587ff6526df1e13 SHA-256: bf8f66e470a72e22a4e0ab7232170aa16b522941d0f54b83a8e91b2ccddee7e9
196 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 0.9549

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9bfe16526b50cfaf737e49bafbbdf3fb/zetetudowogezuvudani.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d2cf47f00dcfea3db91a13b166b2064e/1544653666.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/beeeaeadad432e1c39ed85089af50196/sufaduwitat.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9tmq4l8i4n8adh0djhan3o79kf/47365565171.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ki2thn69e7brgv4o20mjumfkbf/kofixubofubidegujuzixabi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t43l19u1vl335ts9h888ek4la4/lodonoxe.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072a8769cf77---zivifebukarik.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/98fef8a4e828e49934aa94e4924b4db0/givisiwiwitaropiba.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f5cc1c149---nipifexi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cac83d7a---mesubivaxa.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/59348504531.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/88559156986.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d815adda5d---84778323106.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e024964f37ca39c64954be44010ef4c7/kexoretefuvipizagomororo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/12006532117.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/lexafugigogozefisefago.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/dovodilix.pdfIn PDF document text
    • http://abpaluso.com/upload/file/4871255628.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/jiwavujinudoziwega.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe14a5b4a---52669234668.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160893947d56ec---powipufefan.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7a98db71---zugatevitibibosepumolad.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/89866443184.pdfIn PDF document text
    • http://artside.org/data/temp/file/64321587793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=small+hollow+meaningPDF 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_off0001a75c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A75C 28664 bytes
SHA-256: 263fd4d61f848966252ad35454ac1ae65d0ab75ab16955b55eb040623d46b52a
font_00_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 10348 bytes
SHA-256: c1aa534a2847a6f4863f2825781b3276855a7303e9553ee7fcc05fe202d4e0fb
font_01_sfnt_off00013cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 32572 bytes
SHA-256: b3b8776a5a61895dad1c89dd4aa96c199db83b59f45f142c49570c6ca7505142
font_02_sfnt_off000187d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D8 9464 bytes
SHA-256: d488b45572b87e486bdb570651d4740b424a2029604836cd254bbbb73748b760
font_04_sfnt_off0001dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.