Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8f2edb12bd0072…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 11:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1eaed822e2b15f27b268a27d33997642 SHA-1: 0d11d53740ff6e69c30d7d8028af904e265e5500 SHA-256: 9b8f2edb12bd0072ecafbc61725ecc1759f9b8a236552a7c40e5f6fe61fe4f0b
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'link farm' heuristic suggests an attempt to distribute malicious links across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50288800291.pdf In PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/guxubetoronise.pdfIn PDF document text
    • http://erimti.com/userfiles/file/1239013929.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5b1a324b90ed3771b38c8512b6fb1db/405626910.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/guvamafatixegosof.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/78170728675.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/86346304218.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8ea3215da662763065134890fc33b651/mokisipeninikex.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3fe041c05d2a94f86a57233a9a6ac5b8/71646200248.pdfIn PDF document text
    • http://metapolar.hu/tmp/gukiwilofap.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/vomolejelasufapud.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/81382939314.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/vuzilibudofejazalar.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/64092236620.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/76486727439.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161333e1acf922---tuwajimukotipoz.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/susejogabidiriwozezu.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/49367118950.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/gabutufawu.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/44165080898.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091117321173499.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/vepovojapuzuvojepafufi.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/ziwititorimokirisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ielts+pdf+2021PDF 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_off0000ae58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE58 10156 bytes
SHA-256: 407812ae787ecbc9e93e21071298abd7067477a30c4a085502480d60033c728b
font_01_sfnt_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 14760 bytes
SHA-256: 37ca7063be6db1e6871799e9d407bf793ee7beb76e641dbb58802ba41f74a3cf
font_02_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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