Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c625af3f3f194b…

MALICIOUS

PDF

94.9 KB Created: 2021-06-29 00:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8c856839d5c2ee4b2594696af25b035 SHA-1: c422d02d0a58c2c5db0565512a4a2f4900a39b90 SHA-256: b9c625af3f3f194ba510d1212e6c7cee7ab9a6c12d5cf0899a8d0fc32342d982
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9528

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 https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/87df71007846274f97ac98f3f2c4f51a/50316183874.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fbcfd214ba9209cf6f4a1143f8b384de/17884599219.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nju1pgd0popbo7hnul705bpak6/19627468461.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pamunuvevodoperiwadufi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2cab1f4b---geletasimi.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/kosur.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7d243f5c---10999759664.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/3qi2m96h3sai31c86a4tcdm9pq/29413134444.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503074924710310821.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vphtb1i9d7uhbhupcmc7to96p4/birejisewubi.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/84156571449.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/rumifitiwepojuj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee9800953---jefawuredakuwasapube.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727e880c14d---segewow.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852d6542266---webaminazin.pdfIn PDF document text
    • https://loctra.net/userfiles/file/9335997054.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/samakufefubokavudusozin.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6f46de4d372a048ccd3da55388c15b75/92053109130.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c89cd970b8f0dca807be04ec1b47cac7/fudejavuvupinuj.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/digadozin.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e84750f7---53681189134.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3caad4c3b3---48330735511.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8758e04bf---zadisuwipogulukegesusexud.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bb759bcfe2f---tibemo.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labedufalef.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/90c7v9cuck2nhdkkrvic121op3/rolas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=preoperational+thought+definitionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000116c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116C4 17484 bytes
SHA-256: ad16e148ff0b4c852f34d95fd1ae67162ad1167ccbde49b9270fe8d4aac11f4d
font_00_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 22204 bytes
SHA-256: 6973052931c6200804ae8a779ff1db5a2f15591880ae44dd79351080e26418b7
font_02_sfnt_off000130e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 10708 bytes
SHA-256: f40e03a81dcf4fe4d6bf071cda859d519681cf23263ee0de3aaebf39c38b924b
font_03_sfnt_off00014916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14916 2320 bytes
SHA-256: 86893814140eb144a8c82896597f609a854bd79df1c7827385339296db2d693d
font_04_sfnt_off0001532f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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