Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae46a6cc8b5e9691…

MALICIOUS

PDF

91.6 KB Created: 2021-09-06 04:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20eba89dc86d10d9478ad66dff0ded11 SHA-1: 77038dedba50d6663cbe0fcb1ea7e7b8172e8f47 SHA-256: ae46a6cc8b5e96912cd3bfe3ea9f43500ce7215f4949eaa2f73f62d930c0bc57
156 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 WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/acfdf2b206d12e18fd36164150e2cdd6/mimukel.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a9cae732---62239493919.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16110fc0f0ea7b---82982368738.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wawikerozebuk.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108191308312058.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/51867579496.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pk5nbfursfec57tj60hkpfe80j/79028704810.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/pojopamafopikol.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/fibexidatulujokuwino.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/31126078393.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/969831e34993a366895a494e668bd7f6/mukupil.pdfIn PDF document text
    • https://majubesar.info/contents//files/jerisatojezapavosez.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626118061.pdfIn PDF document text
    • https://mvservice.it/file/52927539454.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/60210534341.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082186d879bf---8086275662.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/96657661435.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a1400710fca6b29090d6c0436b465b0b/dinujudalobur.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160732cebc55b4---81250983966.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/1905732127.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/58406800665.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/verinejimosakuja.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/fusakujaposasiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=litanies+of+dutch+battery+pdfPDF 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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 22036 bytes
SHA-256: e41a7b0e07a074321bf079da6a2356354b399ae84d289d5c6b4b2722cd8788b9
font_01_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 10980 bytes
SHA-256: a979041902b9f55ed39b2615a207d2f1a85c665afe7db20c30f0ee266118b2e8
font_02_sfnt_off000148c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1