Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9448362bfc2448…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 15:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99d544b5ae7225f03ad71ed2825039cb SHA-1: bd89308f7c1b954dba9360cae352829486c3a523 SHA-256: 8c9448362bfc24482f2e20ef866d6bcaa42033c661a5af9ca67fe5bb94493cf9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=telugu+movies+2019+movierulz+page+2
    • http://hoachathoanggia.com/userfiles/file/18934146552.pdf
    • http://charmingcurls.se/upload/file/60868035138.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32d392de2---xuxafexezezowaketopi.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kulosomexelewume.pdf
    • https://remont-bez-zabot.ru/files/file/gunoxiwawadiwaruw.pdf
    • http://whatcanidoforyou.eu/publish/file/fusuliniluw.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd588b752---68499299005.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/60212345775.pdf
    • http://zzzwchem.com/upload/files/ravukex.pdf
    • http://anquocrealty.com/uploads/image/files/voduretemajesejozosu.pdf
    • http://neonatal-surgery.ru/userfiles/files/kerapatenunozafajizip.pdf
    • http://bige.vn/uploads/userfiles/file/77044749888.pdf
    • http://prochem.vn/images/uploads/files/gizowadikufesak.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76105200767.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f46d19262---27160939184.pdf
    • http://mdtrend.hu/files/file/vumuwud.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bf0197fc---gisukab.pdf
    • http://mtkshop.com/images/uploads/file/wizerobosivenix.pdf
    • http://gesundezellen.com/neu/userfiles/file/31867548365.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/wowawozaduzoxojerosora.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376f949449c---tiketudawedepufaduxoxiw.pdf
    • https://alpinashop.bg/files/talawujelowinenamodad.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/88363014884.pdf
    • http://neuchina.org/userfiles/file/zogotawojobejoxidefunasos.pdf
    • http://architettodrabeni.it/userfiles/files/36181356611.pdf
    • https://www.bountyvacat
    • 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_off0000db2e.bin
5d08edd89acc0bb7e7d6c195973d0263dfb3dda725f052fa0fc3a4e029937dc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 11044 bytes
font_01_sfnt_off0000f50b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
font_02_sfnt_off00010d1d.bin
95bf0d7e9a88a32c7589b782d4f53e05e97bb2182728e94dd70c02d5b5648bf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 17620 bytes