Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce17fb188495eb67…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0e1bafae480f8e12d83b08f127559af SHA-1: 6af2375ec2d617a507cdb1178e9958227a620d92 SHA-256: ce17fb188495eb675b2e6e49d3423dc9e96ef9557c3404e28195677b510c3e6e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of embedded JavaScript to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=android+d%C3%A9sinstaller+application+syst%C3%A8me
    • https://renhedc.com/uploads/files/202109060746554027.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210914_041358.pdf
    • https://motty-etai-sharon.com/files/files/63674429627.pdf
    • http://tomaszfilipczak.pl/userfiles/file/ritug.pdf
    • http://defhjdrjioo.friend-match.com/upload/files/kirugubaxabiwilej.pdf
    • http://domki-kopalino.pl/pliki/88571724768.pdf
    • https://energooptima.hu/upload/File/kuwitukapekajesuronus.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q0frd8os9d03dqeube835i7lau/48191141727.pdf
    • http://razaviota.ir/basefile/razaviotair/files/39678857234.pdf
    • http://dfanchem.com/upload/files/madutuwegir.pdf
    • http://packamate.com/userfiles/14429935946.pdf
    • http://contua.org/userfiles/file/26413300108.pdf
    • https://koncnc.com/genelresimler/file/zafurizori.pdf
    • https://drhuanghair.com/uploads/files/202109140527054542.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a724ef40d7c72b3635193b3022f1901/notopufabamixu.pdf
    • https://holcom-wd.holcom.vn/webroot/img/files/gotogoxerupusub.pdf
    • https://mikludava.lt/images/files/vupadufube.pdf
    • http://lpsa.cz/userfiles/file/lejeb.pdf
    • http://sk-massimo.com/js/upload/files/mejovetimanezumutalezaw.pdf
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/95786508782.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e567aaae---belafu.pdf
    • http://ressourcengarten.de/azubi/userfiles/files/92405365523.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_off0000ce41.bin
cb9a4f066c254001eddd22bdb8c20f2eec806094a52127233400003356ae9d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 11080 bytes
font_01_sfnt_off0000e768.bin
f024a7c749831922ef6a39382e23799e453ac79efc39d9a9298c07fbef683a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 19020 bytes
font_02_sfnt_off0001172c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 16792 bytes

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