Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dc35d3242f649b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 11:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 249ec616c92bb3e8a60f0ce93228b1d0 SHA-1: 1c86d9e00d6974f86f16dca5352f7baa6b24c4e6 SHA-256: c5dc35d3242f649b59e350e014b3fdc0ac5f127a5f932ad6f88ae1e48b4ed799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://grabnerestriche.at/tadadogu.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/pisewebuvu.pdf
    • http://brenna-ski.pl/userfiles/file/23906962735.pdf
    • http://licausi.it/userfiles/files/52060331186.pdf
    • http://cavusofis.com/images_upload/files/45781224551.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f37b2b60b---xibekimoxonizol.pdf
    • http://pecsimutargygaleria.hu/files/file/35568224602.pdf
    • http://tbm-mova.by/images_from_html_editor/file/sikofuzufusepevo.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/11413590530.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614548aa63192---kiruriwukofijaw.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivukovinikesera.pdf
    • http://telecycling.org/files/file/83584007197.pdf
    • https://mgs-on-track.com/uploads/misc/files/gijizanelutowadafizilok.pdf
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/21723962224.pdf
    • http://balletpanov.com/uploads/files/kanewelekawuzijilusor.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/sanijanidebemisaki.pdf
    • https://sieseam.org/userfiles/files/lobas.pdf
    • http://electriccityusa.com/images/fck_uploads/file/60943907737.pdf
    • https://prestinireedcorp.com/userfiles/files/fadativosapegora.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o2a6l45ejpbr0j6k7284e2slv4/vagufegegoboxelizufo.pdf
    • https://kohphanganhotelandtour.com/userfiles/file/sizawuz.pdf
    • https://marcuspietrek.de/MARCUS/files/file/30018662660.pdf
    • http://beijingxinzhi.com/userfiles/file/20210918045023_2036680528.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/vafovivorunelolotolud.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7dd4ad2540cf6fa6c432f9cd4dd74f55/divefamuwilemosot.pdf
    • http://banhangcongnghe.com/upload/FCK/file/43431314293.pdf
    • http://gamecoast.by/uploads/files/jotuwezegagotuwugofolof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fake+robert+kiyosaki+book+pdf+free+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_off0000b44b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 16792 bytes
font_01_sfnt_off0000cc5d.bin
3e939ad686eab9fd087457eb49ad6f84062040090aaeb2769f8212c0866e39ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 16496 bytes
font_02_sfnt_off0000f696.bin
45e1ebe4ab0bb05478b7f316e52169462fab939fe6f0d0a7161180b8e791edb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10900 bytes