Malicious PDF — malware analysis report

Static analysis result for SHA-256 78329afe1eb699e8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-02 22:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b8aa7f696f91bb603d562c18d48cb46 SHA-1: e9485cc842941dc987dd5aeb602fc3a73225b5d8 SHA-256: 78329afe1eb699e8a59a3ee4becc5a8649af51a6ffb9b8299a443d0e0f600a8d
176 Risk Score

Malware Insights

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

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated and appears to be a screenshot lure, designed to trick users into interacting with a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b429addd8da---21936569884.pdf In PDF document text
    • http://nhadatv.com/webroot/img/files/46952620795.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b8321f7097b31dbb307e9a2d4c6eb21f/83593096731.pdfIn PDF document text
    • http://henca.com/files/details/file/rolotabolome.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f8de8410---15007292924.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6510f7e3---767801632.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3d8b47657a665ca460ad99541f5d770a/75029894377.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/01v8om9m5mtj0draf2a3e79494/jebabelufalojavi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d366f004c82---bowijodosif.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/93652546019.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/tatusovosubatizin.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/1796268075.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/doxapefosipetifumose.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088176abce71---pavowududepafu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4337605ca---32329581624.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/zezidoduxawulojazidojufiw.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bde18601253---pavavebolereguvuvomitur.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160722ede6c9e8---beloledomemamiluvazateti.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/lulenadamilutizukupado.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e7dc0885b9513095d0a1cd9cf1ffbcba/62858172906.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/dejowadinir.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835cbae32a6---zamago.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/54641868079.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/56949373750.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/67996246173.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/47461893311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lennart+nilsson+a+child+is+born+pdfPDF 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_off0000b560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB560 14248 bytes
SHA-256: 323d08d53dea1949bd91a70adb0dfabe047335cebb8c4d6a9c829badcad51cfc
font_01_sfnt_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10816 bytes
SHA-256: 68358e3c7e00985e61f5feaff72256e7425d505447eb0d47d4560cc1651431e3

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