Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b51380abf341945…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 14:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6dae00a990c826eb35b01698aaefe6a3 SHA-1: 6ac8baddec95e0399ae88ac82fc5744b1572c19d SHA-256: 2b51380abf3419459de0778e2398e70d0f96f86d22f7b65bf298ed041754245c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute additional malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document's intent is to trick the user into executing commands, likely to facilitate further infection. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://philabc.ru/uplcv?utm_term=rivals+at+war+firefight+apk PDF link annotation
    • http://faurau.com/luodan/images/userfiles/file/nupufaloda.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/239041945.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/45196345250.pdfIn PDF document text
    • http://redactron.com/userfiles/file/69347513498.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/zokuji.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xodes.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/nitowozeliganimorozuvugiw.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tegejejajugukevoroval.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/41938082554.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/71122087031.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3a65973d620ddbf35481cd4ecf3eeeec/5611217833.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/97bca22500dae8150c6fa2a99faa0eb0/gosibeturije.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132b30157d71---texadisufawa.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/80094176261.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/folutoxopuwovuwo.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/44647053987.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/gunokaxukov.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/37437583645.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/23268726092.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/fuzunotu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/27663258656.pdfIn PDF document text
    • http://jawarakreasi.com/file/76315391007.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/95331026841.pdfIn PDF document text
    • http://indel.sk/userfiles/file/darebuxaxokijozub.pdfIn PDF document text
    • 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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 20396 bytes
SHA-256: 87b73ec320bf98b59a45943d3845e5552e4b788f05cb1d785808a945ed93fa07
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 10700 bytes
SHA-256: 111460291d97f304d3068406b71910bc1cf775dc0547ff09d2535acb5ad43f49

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