Malicious PDF — malware analysis report

Static analysis result for SHA-256 6795fc7270c6b6bd…

MALICIOUS

PDF

92.4 KB Created: 2021-09-01 03:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3180cef130af8df192905ff98c534201 SHA-1: 55bd2df0d6e6092613f935b2daa5ca98bd1dac80 SHA-256: 6795fc7270c6b6bdb2686693968e6e031c886953562ac14fdd5a4e2933db2a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://landpas.pl/upload/file/66150562359.pdf In PDF document text
    • http://aven.su/userfiles/file/vetumis.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/22940584688.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/73468491237.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd9323ec1---2607038102.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85758012117.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/87331224703.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0601c9d4---28140777892.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160823d3964786---37587746154.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/namerekinurexuronuwejur.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/bazezosatinokalikoj.pdfIn PDF document text
    • http://www.asslar.de/downloads/porojixezejususizavabov.pdfIn PDF document text
    • http://asfalon.com/__files/file/lorazixa.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d25a5851---bitefad.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83e8b6252c3163e6b57c89e011ab66c2/25630416458.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vikoxusu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/72902472921.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608399e1c4cb0---voribafijibaxorumigaj.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/40383323211.pdfIn PDF document text
    • https://777mto.info/contents//files/98127691009.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/sifokexow.pdfIn PDF document text
    • http://autovoda.ru/upload/files/33604721958.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c7bbbd11---kibaripukiputegowet.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/37562647207.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/wesukobunexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bleak+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 24264 bytes
SHA-256: eee7379aa5b4940bc7e60ea26b5d0453c7a31b4bc5302b121c9a88c93b63d8b2
font_01_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 10380 bytes
SHA-256: 8c0796f02a5663c5d7960e684c534d71ed04ca40b5ddb8ff305d5ecc0ca29352
font_03_sfnt_off00014c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5E 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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