Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12c7c693eda43de…

MALICIOUS

PDF

71.4 KB Created: 2021-07-17 00:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 203d198fe01c230e1205929570bf8d47 SHA-1: 7aecd73dc18a96aa3ba74174eb17a8e82d94da7f SHA-256: c12c7c693eda43dea342efda9581dab2ba1d3af281b8193ab2df6fb56bfca45a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the document structure suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jexutulibifuwanope.pdf
    • http://dlmberatung.ch/userfiles/files/vabepasuvirakiterepa.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceacc412fb---14420342611.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fba9c3dca32851122fe7da935e7985c8/rawutapalu.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084147282a0d---6352407650.pdf
    • http://munnarinfo.in/userfiles/file/71029747699.pdf
    • http://doks-films.com/pcms/content/file/saximedi.pdf
    • http://abacusnancy.com/userfiles/file/33198319223.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/11359801068.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3179e070ecfa32a706986153bbb7b929/35834317873.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/fegujemigawodexetarobi.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/472297be0aad9a97f184ce59d4905c52/litedefitoxopilogafurumaf.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b6d0df9a---kerakiwebizase.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7320c319---pesonurenugipusavota.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kd0rt7eh69ea3q6t8hq9u35rl3/13235590527.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03feda5975---44685376003.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/kalukusalajux.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5814qb3o7q9l9u7no41cusqa42/24881710626.pdf
    • http://brandnewgoods.net/userfiles/file/pupuwika.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/51c5ca15d4be0078ea8443e2c399b190/2637801180.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c769f7daf92b9cdcb91a7e0133ca632c/49769380369.pdf
    • http://asiancfea.org/userfiles/file/kukunumisotinemebukule.pdf
    • http://beautifulmoda.com/userfiles/files/4384167803.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8c8cb49c3affcd6db2c8c74c5ef8f6d6/nubixijezofamaw.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/76440487501.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=curb+your+enthusiasm+mp3+download
    • 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_off0000b5b3.bin
9ed64993dad5e26d4e6ca310ee2b792b7a974881f1987854e65eebaebe4103f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 11300 bytes
font_01_sfnt_off0000cff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 16792 bytes
font_02_sfnt_off0000e802.bin
681d9d7b2a32a3ca780fc69ab41161cb3344148960827b45e28393078bca37fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 15732 bytes