Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e741aa6f949a01a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 13:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a2e93688052f8323f9a369c01593159 SHA-1: 4a3fe4986fee562fc0b145632a6937b01d901d0a SHA-256: 3e741aa6f949a01ab3bbe62a29789031dbe92a7b2fbe43082b61bbbc289418cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms. This structure is characteristic of a link farm designed to direct users to malicious sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b97513b3008e9b543f8a3554d3ea4818/19690417976.pdf In PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/8418340682.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210605204415.pdfIn PDF document text
    • https://drlanda.hu/user/file/mejowufulejuzovivexegenin.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/gogipowuroposinowew.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dukalifunuzemuv.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/dewifotidesafe.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f47d2826e---42736038298.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e07bf96efc5c184e4c321e4a22ed111/34624493831.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/55cfcd1a99e89b16ee715f55d04184dd/benesadez.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/14123164955.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pibifenudatugekepa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beec996ce5a---26754503147.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/konetopilezawigexukugub.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/bivasenika.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/25d8ad15697519db479183958c2828df/82291103514.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609423803a0ab---jupowivipalaxabofaxaregi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459686e0f7---fawojejole.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/63892488199.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/32253360927.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/sakojam.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f546e208eef---96356872958.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/74538516617.pdfIn PDF document text
    • https://beaszemin.com/files/32302507914.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/tegapozari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ableton+10+manual+downloadPDF 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_off0000c06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06C 17284 bytes
SHA-256: ca2e063f2513d0e1171451e69cbf3632d477d8d2623724fdb09d16ed4af52354
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 10532 bytes
SHA-256: c5c25d91ff833e225cc8a3e64ed5d253eed1eb12a86b3a143d4b5e8940885a16

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