Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e6b623765d094e…

MALICIOUS

PDF

90.3 KB Created: 2021-06-30 00:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14c80ebcdf312da66937e200c90b492c SHA-1: dacc3d4e4543d42343445f057193dc002cd8a8ac SHA-256: c6e6b623765d094e03d4e3cb60422dd01b59d8705ada726df95c0650854f97d7
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://tcihk.com/userfiles/87719691812.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce0dd89ea---26891593948.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/21369315890.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf53485df8---vidizugowuxaruwadedoloxe.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/75085024153.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/lusadakowozifefunasalani.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/73624595558.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nt7t1nh9om1lhttmpnspvj75t6/soguziridavinaxikeruwomad.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a93e21e79---47431833195.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gorokumonowu.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/6039546225.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fm7l1qol3o2iqpob9n8cb9p3ol/5979850232.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zubifufipabedololen.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/zezekogit.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/nonenipovimo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa2ff0d6ae---fegutujab.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b85c6e6f0c83b6dd890d24d59db5a659/xuwajigezurumebinanapete.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160813464a04c2---15435733690.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/84157056303.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/90394390528be0080d2e4936a2428926/xoxuvewutesemode.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/63ja7adfg8kp39et3u16hefm6r/88651343685.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077507e29251---15718890992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=xbox+360+wired+controller+disassemblyPDF link annotation
    • 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_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 17148 bytes
SHA-256: f803c841448e5ec3da37e095647f39ed31d251939a1e1de9fe409885cd17043c
font_02_sfnt_off00013f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 11444 bytes
SHA-256: 75240110673410349e07b955a247e1969cc94fc63ec120ec9a7530e846e32094

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