Malicious PDF — malware analysis report

Static analysis result for SHA-256 e760f78af99fd319…

MALICIOUS

PDF

67.3 KB Created: 2021-09-07 21:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cde0493494feabd58128cd4fa82f0435 SHA-1: 6adb8f1d8450a95025e6961f822c43dfab240f08 SHA-256: e760f78af99fd31963fbccd39d2b7cd416e1339ba54ec34928e2fe0ef4fb0b99
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The document's structure suggests it's an image-based lure designed to trick users into clicking through to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 67 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kftchem.com/upload/files/68123576289.pdf In PDF document text
    • https://businesslife.com/content/file/tugenamepudip.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patud.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/teofphfrofcro46v251b2dnlc4/96932150032.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3496c969c8---bunilatelajarisuwepepa.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/pifunujajefikosaxiwos.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/navapedazejafepejojotafar.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/lanuvubuvejolefa.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107281303092277469z2xdm.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qq3am8en16nfiid7gcdqk61lf0/65549801441.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97660a32a---40437601497.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/i285u52tgm1kj8chc8vvrmhq1e/xovawowexobotazud.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fonorepukazipofakipo.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/67652172332.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/firifagi.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/7186855081.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/61600067277.pdfIn PDF document text
    • https://tonitomov.com/picture/file/10309853352.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/bolavatugopudabavuxagupog.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ccdaa1f35---woritonagejenujudefoki.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/20008914041.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/11902800229.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/18553941361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=iadc+manual+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_off0000aeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEA 14064 bytes
SHA-256: 543e1f99bb4434e49f1edfa834165cbfbde8adeffc3c89517c42d8b8ccdd3291
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10124 bytes
SHA-256: 5e99786e4623cb49a4daa900e05f0803f7bca4030e84f7c36b863af1ab7a35cc
font_02_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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