Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c0e625af7f86af…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 11:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2926bdd32e57fbed4209e51cd1b31964 SHA-1: 49496d4b5ec4a2d2086839a5fba1427abf6aea48 SHA-256: d3c0e625af7f86afb724e60e364b1122c27467b2cfc9ddf8d93e3610b2bd692f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of download-related terms in URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=snaptube+apk+download+2020+latest+version PDF link annotation
    • http://dayou.tw/uploadpic/files/202109041801552737.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/pefabo.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/riwawav.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/15425617001.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/fajurilesa.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/vilevefirabumitizanu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dced8092ae---varujenowizoge.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lapovonanawakizugedega.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/dulejuzizowanomasab.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/geriwotibupom.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/14255878279.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/nonadugiwafobuzama.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ad818053---lodipalat.pdfIn PDF document text
    • http://araratmebel.ru/img/file/60428522657.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wiguto.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5abe59aa7a20588977a1cdcf7cc99e13/99494334219.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/wafamupoxup.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/10262521892.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/rixepuzav.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/dewegagibipobale.pdfIn PDF document text
    • http://gibisch.org/files/files/lawopu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/72862dfdfe80bdbe29b80252616e64d9/21911603535.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/bitogononeripixiworoniz.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/13243350774.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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 19420 bytes
SHA-256: 3fea1a2c5a3e13cd8fccc51f379b0e73ec7188a570b82fb01b3e2e6503991d9b
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 11184 bytes
SHA-256: 1904534a23527898490317edf5a8df717ea3ab7d9b1295083a7fcd267c5a5521

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