Malicious PDF — malware analysis report

Static analysis result for SHA-256 88963397617c424b…

MALICIOUS

PDF

71.2 KB Created: 2021-05-21 07:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 032b08218f32502316450bcd938449b3 SHA-1: 0cc95196b3698caea975b9aaa551bab8ebfeac36 SHA-256: 88963397617c424b290ff7a3b6c2841ce16eca8f212bf682b06b62a0ce7de2fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=como+hacer+una+pechuga+a+la+plancha+jugosa
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884ce1a9177---74154507253.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7cba511a2c0408dd0fe9aa4022528ea/gaxedutukupifa.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/023hbgmgqnc338k1area44j536/lirabulusaluginotemabuwo.pdf
    • http://funperm.ru/content/file/79981929046.pdf
    • http://novussiteyonetimi.com/uploads/file/xisegojazulapipemef.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/371c017306f5d23df59090b8c0c51935/59606570424.pdf
    • http://bannermaul.com/userData/board/file/sovufawojitat.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sennlfrierqmj5aei3uc0cdtb5/kefigefatanotafenu.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee3d1fb66---24350802992.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160901e227b419---33761765813.pdf
    • http://myjobcareer.net/userfiles/file/2021051905351573499.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7fcad4081965c65342b3b9d84f0d24b6/39621117633.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce685f7a1---dotedetowexeni.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3079381f1c9fcdf9eb43570b733039b9/42833283610.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/33fa344726a395a3a457ac7b1a0f07d4/remegavugitugi.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1092802fc---dogufunabuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62b.bin
0c9f79fd188bcaf48c68d2fcd99e9f8c7abcd41c1ff4b033a35d81cde5a8d1ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 5328 bytes
font_01_sfnt_off0000e822.bin
6555bad73f5a7bed72d375cf256605c1da409d82fd25cfb0bb742fe1f336095b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 11700 bytes

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