Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efcf8c54c9f4c3e…

MALICIOUS

PDF

88.3 KB Created: 2021-08-03 17:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df67df2db5a7fa920780e92f6d53e554 SHA-1: 9aceadd1c8243acc30234e7cd1f01882622a5c7c SHA-256: 8efcf8c54c9f4c3e6d79449e4e52c74469ec7e24960d10a0c4f3940ded0ad2ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on disposable domains or compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the heuristic firings and URL analysis suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=wyze+cam+pan+issues
    • http://hangquangauto.com/files/tawabixasulik.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210629005958.pdf
    • http://botosani.ro/img/uploads/file/fituma.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/59296060874.pdf
    • https://anninhsieuthi.online/upload/files/91398136769.pdf
    • http://cdkkck.com/uploadfile/file/20210616034634.pdf
    • http://energo-winstal.pl/userfiles/file/nizosofaruxewasaku.pdf
    • http://stalmost.pl/userfiles/file/35940245892.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16083167fb8deb---murakevirixidelovo.pdf
    • http://www.awakohchang.com/image/upload/File/okujowujodusas.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/firoxosuvoxofutafewe.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d962df1b290---7510624904.pdf
    • http://alexhoffordphotography.com/temp/files/file/14221883387.pdf
    • https://ijaetis.org/ckfinder/userfiles/files/13748509152.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5d18c925eceb1ed36d61c4476d1cefd3/mamagizuzivabodebuge.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc569686ab18daeef29a62fcda43aa1a/vijotoforuniv.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcd70663b---60756658191.pdf
    • http://mashtalkandil.com/userfiles/file/34060969238.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/5jia7rh70onpjq95gfmckc7pj2/55708460937.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb11b92bf0---66011983074.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/sumepili.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ejq6nghma8pi3i6siqok6f3175/baxapojuganenubugefa.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b7a66bc3787fa87871ee08de933d1627/33948151177.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_off0000f6e5.bin
7493d4e682b1e9bf5b6666cc54b1f63f44641c5e9203195f144af6df50f6e785
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 10440 bytes
font_01_sfnt_off00010e9a.bin
97305f4c6e743a79137e4f24994e5cfaf0a9a18de79a2de46dd91eea18557e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 17376 bytes
font_02_sfnt_off00013c21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 16792 bytes