Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2403b8db9d02fc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 18:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f9513353074812576225b229c7e06c4 SHA-1: b7528aa39168a0e7a2e4d56fb0cdbd51983c68a8 SHA-256: 6c2403b8db9d02fca57e34b5bd62868e954b0e5b904729b090c214bba74d4a40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nfc-lampang.com/user_img/files/julufakarubofat.pdf In PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/85392493697.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pepoguvimajizepok.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/97884704115.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cfcf79f---12947268228.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/51475206166.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/74579917894.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rekadafokuvuj.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/57224926973.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0a6580b3c45ddd0a0a89b34caffd0f9a/jedavagepasekigovuligu.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/82466417511.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vinez.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/69371796083.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1bf41d0a0b8109185601cc6fe43f6db0/nonuwinelaperajumu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090109030364.pdfIn PDF document text
    • https://mbbs.hr/files/vepekuliludibawuf.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/20089444731.pdfIn PDF document text
    • https://rubfila.in/files/file/77297745951.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/62311007876.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/77789560359.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/22016919630.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/pogoliwi.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/wupigajojomepadukuwozerur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=alexa+skills+storePDF 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_off0000c5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 15912 bytes
SHA-256: f6541cc1a217a0e7b39f9c13afb55b775ed7660d51a4a50b3d3e985e01643545
font_02_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 10172 bytes
SHA-256: 4a4bede77f53e38524ea265ea8adf10761ba8bc54d891f2cb955afc1e406b86c

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