Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dba9e783cfa8cd…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 10:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28a3047706840c36ba583d193f8722d2 SHA-1: 7556213049f0a96ebe9c7ada9be40967e090c3c6 SHA-256: e6dba9e783cfa8cd793f21458f00c57742594f1308dc5d63c89042675cb4674a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://moveo-sport.pl/userfiles/file/fevefu.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2926bcd2---tomojagogizo.pdf
    • http://cephedanismani.com/images/pages/file/faforaniwife.pdf
    • http://dxqzx.com/ckfinder/userfiles/files/20210901_225936.pdf
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fikuxiraxu.pdf
    • https://mobilpetrol.olajpark.hu/files/files/68197107523.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/96138963385.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemino.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/togutepoxojizav.pdf
    • http://etpatatietpatata.com/userfiles/files/36386841081.pdf
    • http://pribatu.lamilagrosaimport.com/images/files/bopojotimenup.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac5a9174b---pafosajokagelixabilosaj.pdf
    • https://saptabangunmanunggal.com/indomobils/upload/file/nuzogasugepewozodit.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d683ca97ed12faffe4ee69de36953119/19450475194.pdf
    • http://kehlux.lu/userfiles/files/99594445013.pdf
    • http://dream-mebel.com/pic/file/34373990295.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/38789477450.pdf
    • https://negaratoto.com/contents/files/pibenokunasuwa.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/totipomufaregizixomijupa.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/56868796371.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/tasefupugovobinazedejiga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=golf+clash+mod+apk+new+version+2020
    • 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_off0000e6a6.bin
176c31c09260bf96f8a1d5c4bb6f5e5fff0186f9d686031173676c18d5f99fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 18068 bytes
font_01_sfnt_off00011574.bin
4c9429f5d4d7d902c56b4f4eb936bf1e0ef7747742498e7e18332b2e95c79027
pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 11312 bytes
font_02_sfnt_off00012ff4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 16792 bytes