Malicious PDF — malware analysis report

Static analysis result for SHA-256 341552e3e0c1b434…

MALICIOUS

PDF

69.8 KB Created: 2021-09-05 01:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b40b4d30e19ed1c1b9b33c25f68482db SHA-1: 34193c3b687dd0cf7ad639f321300be1deecad4a SHA-256: 341552e3e0c1b434cd3b2f50f4f6b74065216dc4b04443fab144a965925278b3
176 Risk Score

Malware Insights

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

The PDF is detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure with its image-only content and numerous links. The links point to a variety of domains, some of which appear to be compromised WordPress installations or hosted on disposable infrastructure, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://solyaris.pro/admin/ckfinder/userfiles/files/kamubitorobabukiji.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a01952fdf55786f767d28c503cc4943a/30914542886.pdfIn PDF document text
    • https://bloc-immo.com/images/medozopolexakow.pdfIn PDF document text
    • https://citytrafik.nu/images/file/15119881629.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/73819079876.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82a0ae84e---91894606077.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4df11e450b---jusowik.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/67206642977.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3uaesl2fbq1ko0ggc57d71qk54/bomuzivajutovik.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44f871f4e95d93e77eed948e690b4dfd/87935473770.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73501bcc44.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/kabawobapane.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fa50298f---88236100187.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/4031038403.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210819_080624.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e46f41a5---36292892208.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/dofopef.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0bc53872---mesirulatosifilafi.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sised.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ac89195c---50101396160.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fogozuxefivuwi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/nuwuxomirebiveluxig.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j1u284lbuqcjqr5a0gom035bo8/vajiginazuvumunoxoposa.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/94274635204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ducati+panigale+service+manualPDF 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 14220 bytes
SHA-256: 9a1ef8b9eab642922068c1c78a743e81390a236c44e2354faca7b8a5742e8bac
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10764 bytes
SHA-256: 0f636ba0953570be3f561a4d64da8a0d60aa09985feac843953b041ca7d51ad6