Malicious PDF — malware analysis report

Static analysis result for SHA-256 905bef27fd50f7da…

MALICIOUS

PDF

122.5 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: 40c09ac9946eaca14f87f74e42fbe204 SHA-1: f691fd96f81b27e421e98f3fff67e40cace504e6 SHA-256: 905bef27fd50f7da11afed198dc07bd3c8f32d8bf10b3e2be1417c1ed662e4cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, supporting the assessment of malicious intent. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3126

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 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

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

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