Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1221230542ecf1…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 01:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8979c8df3115db88637c513e5f416c8f SHA-1: 8a4c68a2da0bc5e7b0f9c0791708429883dbc454 SHA-256: 9f1221230542ecf171dd54c91cf731270d2d569925f34590938d653818819b44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/df4qk1f5kepkmnb0a33gp31hg0/31083491248.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acdf88ace---lidupojexugimixi.pdf
    • http://ekolojikweb.net/upld/userfiles/file/lisulowolozaramo.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083283aefab5---zodixuvisosefotosox.pdf
    • https://mosconi.net/userfiles/file/baxewoxo.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aadde14c---57234905010.pdf
    • http://linkingpeople.info/userfiles/file/43118490227.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d48e56072d49fd5216279590e8fb38c/gobufetusabufubejelavati.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4746051e---7980077085.pdf
    • http://appartenvue.net/appart/upload/images/68663675317.pdf
    • https://steklo-shik.ru/userfiles/file/sonadobejezuma.pdf
    • https://chris-arnold.com/userfiles/file/wilino.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c32fc2eb1d8e47321dfa2f5642033c3e/47147918727.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/pusataz.pdf
    • https://travelsafeway.com/userfiles/file/18953472960.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f6c3a13b---sanukavobatodumixeweg.pdf
    • http://www.ez4parcel.net/upfile/files/2021/06/28/60433064435.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pc8u40l2s8uto7628srmi0maik/tadudiwemesufidota.pdf
    • http://iehyun.com/editorupload/file/xodobafuwoxoreranufefetox.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944214615c2---28933621506.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ed1d82842c1851e31d94d38b40e2933f/503629958.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96bf5baef---puruvawuve.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4e694fd0bfb9879d6f1076d56ef8a0e7/18628142535.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=order+in+space+keith+critchlow+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_off0000ece9.bin
cfd8187fdfb70f4b6c4749bd94e1c2242e45b24c6b61ab23a65f50aa4720903e
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 10920 bytes
font_01_sfnt_off00010639.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 16792 bytes
font_02_sfnt_off00011e4b.bin
75b2b298e286e41c09fda8dbad219b83a8dc55ce181b625a2b912d87987a4da0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 17332 bytes