Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaa6a815cb03c5c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 06:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db16ebb28e60794af5d996893bbb01df SHA-1: f9a58b6142abfb3669ff8abe260af6e8832d4f50 SHA-256: fcaa6a815cb03c5cc291742e8dd9d95f070a730e4d844f3989441fe6e647734a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users to malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=schizophrenia+and+bipolar+disorder+pdf PDF link annotation
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c923a476d18fdab7140786f2564c6135/fifuzix.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/16558191744.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/78586533687.pdfIn PDF document text
    • http://crm333.com/documentos/file/mukerarunumegogu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c5ae4a91ac38a1499482b4af064ea34b/putofixefidi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782532bbccd---xubajisol.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d19311055fff19ccbf19ea485b6e8a9d/wumusom.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/74230742527.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d9283ab17---18205433446.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/zupesemitufemazadilefe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/74523485325.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/r1jl4jp8fnntrb519mscakn0dd/busokat.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f612cbacda5a6ac96556f7e984350dab/zirekufotaj.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f7eaaac8ebb8ccb728ea7f32491e3923/42128529683.pdfIn PDF document text
    • https://coevent.ru/upload/files/xafalabudanavawu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8a0bf1943c17d5ef651f8086a4960da9/1529282559.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/56799109753.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/75175302000.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/83567870727.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050704062372.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3219c53be3---32888025753.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/dorivetiraranusegimiluj.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081230386edc---29896638551.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pegun.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/62cc469a929ff531d9ac75237659827f/90645022107.pdfIn PDF document text
    • 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_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 16704 bytes
SHA-256: 9706622eea6ad55eadbad814476b7661796c92915cb07b55da1be76acdbea332
font_01_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 10896 bytes
SHA-256: 9ca66e550e93a0ac1cf04f9dc6f89f2c4e901022f524496e85299519f09649bd
font_02_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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