Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6eeef9928b26b4…

MALICIOUS

PDF

79.3 KB Created: 2021-07-17 06:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9566b70c1d06e9c17b6e9272812cd980 SHA-1: 20f24659eb507f4acffaa37966c2e5fa9fa42a55 SHA-256: ac6eeef9928b26b4eefc7ce82d25764fc788a32050250e59e91aec79eaf52e08
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://quiltingacademy.info/fckeditor/userfiles/file/95628924772.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5e7b5211---fimakapijekugojevotekoxo.pdf
    • https://rocksoliddesigns.biz/userfiles/file/jomujigijebodebodasum.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8a75fe5648f60b48b2af3d98d0bb7ffd/monezufemukufejupuv.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/funomujupepibukovoso.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095df8a75da7---lidetarugapaxudok.pdf
    • http://vitanova-cattery.com/upload/file/40654359215.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ae004579bb3---34033327484.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609666b0bf24e---38927056405.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofifitutonalirovizevaj.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/fatujubugexilo.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0bc327faf---22749171813.pdf
    • http://saothienemb.com/uploads/images/files/67048939446.pdf
    • https://cahayaapi1.com/contents//files/bovakasevofowugovizem.pdf
    • https://clubslotalmatriche.com/calcas/file/bebofixovadaluleponiwez.pdf
    • http://munsusa.org/userfiles/file/20210601110036.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fb6ced04---pusurojaregu.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da3a7462f3223085460bba5eaf5a1fbd/20449785264.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cd82c9b259780c92cd17729fdc668437/17628079163.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cec2c82e5---86402497606.pdf
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/49255036360.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9bc33a15128449722b3f387f25a36255/powafigiguviziwure.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fast+track+to+fce+workbook+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfdf.bin
fbe44a0931821c521b43c3bc3935a93134d08474b4b76eea1a66831b19bfae1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 18380 bytes
font_01_sfnt_off0000fde8.bin
b843a09d51f07abe2c43c829217f61024a5f209192f28082fcbf6ae1086935ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10484 bytes
font_02_sfnt_off00011606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes