Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fc0e6dd551276f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 07:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41aff6fea4d55104c4e935fcac49d3f9 SHA-1: 21417f716067de8d355e756883dcd5c94d72c06d SHA-256: 45fc0e6dd551276f662135e21f69c8f7094007b1aa4da80fc2a57f9f3919fb2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

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://pistant.ru/uplcv?utm_term=fiche+de+consignation+electrique+pdf PDF link annotation
    • https://dodomacnosti.net/data/file/kixut.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/zoloxuziwunazewidagituxa.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/25055952418.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090423a86785---kutik.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/53c291f9f5c532f610109e43c91b6ffb/75091070557.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607619242121b---95176211744.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/bafoposisagomori.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a831a32fb0f---xikonafujuvolagezirusomu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9aae304e---vifopevisuzuzaje.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gowozaregilewina.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/48091674166.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9757b5bd4---37938189225.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c13bb4abb3a---45605438651.pdfIn PDF document text
    • http://runhouchem.com/upload/files/35068080585.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38a2840731---dazonosikebasaji.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/firininirojexelovel.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a71a5969c---789757601.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210629_DF460C559C1072BC.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b4172121798---gajigase.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/53412140163.pdfIn PDF document text
    • http://puisan.ru/uploads/file/busafubaworokolisapaf.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/2691351756.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/likekurodi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/11b9de1280431296cd97271d02a03c5b/joforowigole.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161046b177e36d---36561569952.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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 19932 bytes
SHA-256: a566199364f9739f2853de4aa0ea9eece49d1173e29aadf2baaf8c4b98bd372b
font_01_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 11124 bytes
SHA-256: 9bf94140ad41143e9c4ecace175c27b8c0d60d4980660fbdc010ea2f4e827bc2
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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