Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf32f0a271d7f0d8…

MALICIOUS

PDF

113.1 KB Created: 2021-07-01 13:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e42103a64dc2c1ac94e2ebbaf773c5ce SHA-1: b49df195729ca5e044735b8ca2540d5fda18faa5 SHA-256: cf32f0a271d7f0d89b59f2b584977699e6adb34c66cf728fccb69764a1f7794e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d56c2014---51844062027.pdf In PDF document text
    • http://cursosadistanciayonline.com/medios//files/1570474444.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b9296c07---tidukubofukujulewepenek.pdfIn PDF document text
    • https://schmitz.cz/res/file/95194931395.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/xemopabate.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/rmj4lhrrkicnvuu5fl2idu58g6/bakepivefutakix.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lugarorafemojiwarodup.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e8ee8b476768432c22f26d51aa798522/tebonawizevirajemoxonumu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4ddad4ad---zolimolubomozunupu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d305c19a900---67832939644.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a808eacda---42919073040.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a618f0fa1---giruxabopo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/64vv4mf06rk6uu4rld052qjs3t/94174822028.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b685aea4c49---gagilaze.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/dc3ee1090a9a4488d3f53f272cabd077/dulinezosam.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f214c880---33722272646.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e97ca3cdd---24497729789.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b76cd71c---madovekozaxogosari.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u1mr8cgnj5h50b0a9fsn3dg0ha/52607734005.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/sitozizirigamaxud.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a998e3ccf72---nujazaxupavi.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/gp13ca8bp1kgg6f668ghoeob0r/14494734409.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e5608e2c6e7e45ed0ed5e20df9032701/41443504451.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/rikosixafibokun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=acute+nose+bleedPDF 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_off00015ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADE 17368 bytes
SHA-256: 7c576ad1e84c34e3802f1ed79b190145392716b6e395f099893b1b4410b6c90b
font_01_sfnt_off0001882f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882F 10228 bytes
SHA-256: 2fa241b364e31de456daab23861ef32990f40a9984a58a161d1092990b52d45a
font_02_sfnt_off00019f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1