Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5aeb404bc55119…

MALICIOUS

PDF

122.1 KB Created: 2021-09-05 05:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 977586454255f25dbd5b5f2f4cd10d27 SHA-1: 01eeabc1e60493fcde9abacdb326737cdaa49c6f SHA-256: 3c5aeb404bc551199dd59545937b9e1067006d5efc360007934e763dd5ba5a79
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress upload storage. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's purpose is to trick the user into paying fees for a prize or parcel. The embedded JavaScript likely facilitates the redirection or further exploitation, contributing to the advance-fee scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://x-software.cz/data/file/56147582958.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/41127791560.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a5951044ed680e3f8197e2a6ab6a405e/12693500493.pdf
    • https://observatoire-omic.org/documents/file/12682496187.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/28960820065.pdf
    • http://dentherapia.hu/files/file/74314251072.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/51208820762.pdf
    • http://finpacecuador.com/userfiles/file/23519954942.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/34311215238.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/56841739973.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/mojirarugosowugupol.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822deccdc97---43999933144.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b00643c3c---26765858680.pdf
    • http://hyundaidongdo3s.com/images/files/pinerenupigeruvudaxax.pdf
    • https://acrgroup.nl/userfiles/file/bojumenuwekukiwajasawe.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480e7ca90f---divabunit.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609651121025a---86542154602.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/96387933279.pdf
    • http://imssp.by/data/images/fxeditor/file/putoramatinifonugodexod.pdf
    • http://aj-logistics.com/stock/userfiles/file/nalixiporesudibakepar.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608953bc9c239---turenugedezused.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a07b4a892b---55221516516.pdf
    • http://gtlmarinefuel.com/userfiles/file/widij.pdf
    • https://latework.cz/soubory/51595438703.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=analysis+of+variance+for+regression+pdf
    • 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_off00017270.bin
65aaff0d5c742f6dfe56db97434fb9e8f3627a850a9f9c9060f55c3f3648547a
pdf-font-stream PDF embedded font (sfnt) at offset 0x17270 21176 bytes
font_01_sfnt_off0001a93a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A93A 16792 bytes
font_02_sfnt_off0001c151.bin
7e7425044bf49deb8fd0a014a6519f3688e18a381245cc816fa71138a5700d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C151 10860 bytes