Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b110a9e3eb71a3b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 05:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cd81ef3928ec192ba56e8b44943911f SHA-1: 9e848ff78567d5430aed561f7f43a29b97cfae5f SHA-256: 9b110a9e3eb71a3ba49934e25378907b321c359ce7d575f09eda3205ca903372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to external websites, many hosted on compromised CMS platforms. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using link farms on potentially compromised or disposable hosting to distribute content. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://expobar.vn/app/webroot/files/images/pages/files/fepebijugozopizulutowa.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b0cb0c33a247f46e6a015d12a4b7a58f/tokazovad.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/4aoh6jh5up4a9qu8gfbtnvtml6/nozukezorarupefoz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf814aacab7---25844457613.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/jikup.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210611065836.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/wapajaf.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a0f074fe7385e59a4ff1daebf9456a27/83887576756.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/kujozolavusafedefejinep.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98786358230.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/zezuga.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c607f859eab---xibonapo.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/32109829142.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bf76667c0---1484539882.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/46917265359.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/70059360677.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c089033c---pivul.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tojorarefepewisu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/dbf726e2209f58d2143484debe4d2429/74683082474.pdfIn PDF document text
    • https://brickzoo.it/file/ligimuju.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/fixosuguvadiresonutosomi.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/10706903039.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2039bf87a2cce8d92fb8b6abc2542945/19250036819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=difference+between+probability+sampling+and+non+probability+sampling+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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 11304 bytes
SHA-256: 18798bee18e45847404308d8642059e810938aac99be11dee8ecc7c2df3228b3
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 16828 bytes
SHA-256: 97172fad45d8d79e73df840403c9fd6bd1baf716ccbc2955ea78f47336067f02
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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