Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89ed95f8cee62c1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 16:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 663243fccb90b963838426b8a4b7bb52 SHA-1: 74f63a2086cf50417ea3ff5d3beb31705398cf94 SHA-256: c89ed95f8cee62c1fbe02840d36db8d077fce9a6192b94b25e95dff1320a3283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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://laborke.ru/uplcv?utm_term=supersu+pro+apk+download PDF link annotation
    • https://nic-irq.com/userfiles/files/juwozigorugusilu.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/kakupixabodamibuti.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/91754806921.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/sozokapivitanosuxuke.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/98237635756.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1d0075d41215ef8e750dcd2fe00f0baf/52133901919.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/xovijezosesodakuk.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2ee2082f5---26224085149.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/95545237787.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/rizimuduvutazejoxemorup.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/16532780869.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/zatajidekosaje.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/71070917064.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/wibivuvadonopip.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l8b6gb48l2ue4e8aheqfvr1p29/jasevutidenim.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/64322819957.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/22737497707.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/33602898449.pdfIn PDF document text
    • http://mcutech.net/files/85436574288.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/74949629187.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/melilala.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf51b9da24---fasagugawete.pdfIn PDF document text
    • http://eternaseguros.net/files/files/3102395050.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/gememano.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/21966678345.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0ac1bba0---tobedasurasuvedipu.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://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_off0000b724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 10548 bytes
SHA-256: 3c9e45ccd4a1da3cf58f45440cc5b117fcd7e31d7772c0508a98ead1102db795
font_02_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 17252 bytes
SHA-256: b0a1696197e9f3a279b4a913d5ae73e3a8afa141b7405601edca8020faf562a9

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