Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ed8176b62c7518…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 03:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c120feb79a2e74b0ac928b844d2a457b SHA-1: 481d9793f0f0da80673eb034fa37ecf5354fc0c5 SHA-256: 46ed8176b62c75180db8466f865e5ab2bd7e5d261df09589da46b742128b0330
164 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress uploads or disposable domains, indicating a likely attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=upsc+general+knowledge+questions+and+answers+pdf PDF link annotation
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/titolofimas.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/82972465266.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210906_010452.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/76657624885.pdfIn PDF document text
    • http://leguido.net/files/36778949586.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/99313091077.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613e565546267---84315531214.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8c10d5bcd7d1e828a3adf01ae08bedeb/xerofemusodi.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/kazeta.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fidewixuzarudaziba.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/44754892152.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/18972294859.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/fipimajiw.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/4963906326.pdfIn PDF document text
    • https://viceda.com/userfiles/file/35796645445.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/bozokelumefegifo.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/dodekowuxazolex.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/89892010576.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/9730143232.pdfIn PDF document text
    • https://fasleh.net/Files/files/54457284822.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210913010324.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/tutajefubazogob.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f8869268c78714a6d92aee749a15fe70/digofipokobaximufifatujak.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8ba1300c47687f60fbfddc572b598af2/98792804092.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/jedibabe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 11224 bytes
SHA-256: 6c81132bd7cf07c97888ede30273bab24332a66b581963cda3b3d0dad0341bca
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 17844 bytes
SHA-256: e7c43b9cbbb801df365fe6993a1b9049f0195bb7bcdf45ec1ac53c8beb75aacb
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1