Malicious PDF — malware analysis report

Static analysis result for SHA-256 e960ceff71e032d8…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 12:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9d1ebe9f42ed1abcd6aaf924ee72b6d SHA-1: ab004a52588ecf6ff75880fd675013417ffd8e41 SHA-256: e960ceff71e032d8d2dccd3d4ae698d909e1db0a5bc11db110d9002bf0a1eee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the heuristic firings and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crysiq.ru/uplcv?utm_term=video+downloader+mp3+apk PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161467d163efb9---52401468965.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/15649346732.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613798a603e8c---56323826299.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/soloxonolibeke.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210903181648094.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8ece1bf68edfe484f6ca9d1ca7ca9b0f/42940640669.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/tupifalovujebijumaj.pdfIn PDF document text
    • http://didula.com/img/file/91829246782.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/31554333213.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d455bb465b---25921243307.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/77817287201.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kuroboguvilif.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/morevukezabev.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/duxanevalivoboj.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/nasafarafuvuw.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/9700200933.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/14414334692.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/55827216831.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/tigugawukolejotuvoko.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/melure.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c09d7958972d3cd155b4c671309dd9a5/62802758224.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/kitevakejawogivosujitapo.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/wuzapopurubitiwap.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/baradubevawusabiji.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/pozawutired.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/7310385968.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_off0000b563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB563 10608 bytes
SHA-256: 1599a34db29182f3f5215536089bfbc5de3f353afb573b2f99415699427602c1
font_01_sfnt_off0000cd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 16476 bytes
SHA-256: b96aec2634014700a3265489efd3ddd7ac39b7fbea22ba87cb9e0b974c4b4bb7
font_02_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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