Malicious PDF — malware analysis report

Static analysis result for SHA-256 515721672a6ecad4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 02:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f0fd96e9b615e440ff75eb9b42e0e64 SHA-1: 5bc2dbcc0d7aec730c616116d78ad41e033bf4d6 SHA-256: 515721672a6ecad4a36266d6a9a5f673a3793535d025cf7f1eda5349a7b778bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable domains and compromised WordPress upload directories, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://blokhol.com/upload/files/babizujumuvomirusif.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb29ec3820---76135909835.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3631d2bb012b3a4d3e298321faf44e88/letaliwevonewo.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///romudanebuluzisoz.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ce277a2f3393fb3fb6ae4022328a85ab/6855008360.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/wogipiwudetowirosopur.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/pikemiminafadaba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229985ecb1---mefepusujibukadasujorilek.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210905_2E69839D09A61598.pdfIn PDF document text
    • http://rld-carbon.ru/file/xubuvap.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/47369389059.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108312254046905.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/53884683943.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/73051342485.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109110158251751.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c114fbe8a541onjbtjdbp6i4vq/jegisene.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jizomajitejiwudafuda.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/jugemugijozojezaleko.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_A01A58EFDCC32F5F.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/jimepinelevutasopadikuta.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/52007983082.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/fowotegemogubixejen.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/8521474301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=word+villas+mod+apkPDF 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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10372 bytes
SHA-256: 82b24fc77131eaf4f72f1c2027123927de73751f0ec5cd890afff82edb5f46a7
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 18404 bytes
SHA-256: 2dc7e53af3c1d7f5a6dcd28c77b2cd33cc6f193c2a840f1b5fc7d1ad37b5e2dc

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