Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa0a394fd5e4b49…

MALICIOUS

PDF

67.0 KB Created: 2021-09-15 21:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98637a55fa2ee577aef47ec88cfad5b7 SHA-1: 9084f16676bf160116618c4de02f1cbcf889b4e5 SHA-256: 4fa0a394fd5e4b49888f1c24d38c8b44fd8bade451243f01b04ca7255200637a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure, presenting an image that conceals a clickable link. This technique is frequently used in phishing campaigns to direct users to malicious websites. The presence of numerous links, many hosted on disposable or compromised domains, further supports a phishing or malware distribution intent. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 1 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.
  • 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://csc0535.com/userfiles/file/20210912121421_1wj3m4.pdf In PDF document text
    • http://osayit.com/images/file/xubakilusegamivom.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/fesaloxokonudaroxaf.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jupuvisuwij.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bbe23a42---42603673387.pdfIn PDF document text
    • http://inercial.es/uploads/files/voziwifexapup.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210903210325.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/galofibuzogizad.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b33edb024---90700299142.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/setuzixenokosagili.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/65308198770.pdfIn PDF document text
    • http://co-mit.com/uploads/files/bexudubefemipube.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daae9651a7---zuziwadisavulu.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/85856630831.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fc00e367e7f24a6e9f0df1e59d26c010/84209855560.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/seripe.pdfIn PDF document text
    • http://186086.com/upload/files/vibizolilu.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/56152354830.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/86144898945.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/35546863488.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/vexezufoduxibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=scan+to+download+android+tutuappPDF 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_off0000abd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD1 14268 bytes
SHA-256: ef3a73d7b929ee803d5506eee4fcfbf3dea24cc91c5891560a58d11eec350030
font_01_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 10468 bytes
SHA-256: f161ca20d410a6d6de5d0c325ee165c001a9bb8085efe6119872166590d51acf
font_02_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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