Malicious PDF — malware analysis report

Static analysis result for SHA-256 62af3ddbcff4792f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 03:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1c7a6bb16bf74be79d33b2730cafe73 SHA-1: 0d7e195aabe48dfdb181049fc7fe33ad37ae6351 SHA-256: 62af3ddbcff4792f56a32093df8a48d8ebeff8ac920751385d22308de8995f1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent, likely involving the download of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=hitman+silent+assassin+apk PDF link annotation
    • https://praktijk-fix.nl/userfiles/image/file/93914803620.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109140704572792.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613688ba55d59---63453820845.pdfIn PDF document text
    • https://businesslife.com/content/file/remax.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/ragidavopuxutudowi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b2c4c46c903da01249eb7772a91a9b71/99481202009.pdfIn PDF document text
    • http://fpole.ru/sadm_files/konosutujozoput.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/wenisabuxe.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/16419601866.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ed896766---24166493052.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/15193772137.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kagonixikatufanagixud.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/78661444402.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/degarivazazeji.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/33982216055.pdfIn PDF document text
    • http://teknis.it/userfiles/files/wijepaliwotebexokokelom.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/85718866380.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/noxukatedadobinivilinad.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9e46e9f67874f43415bf0361c184fe45/pemodejigisuluwazoga.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/1548253695.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/pupaxanag.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/vabawekofutibidezigulazi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5877a4fe4d95fb36549aec99ca534d81/81000174945.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_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 10276 bytes
SHA-256: 593df72dd72caff83690d5d43ca0545b6016b6f8b586f2e34ddacd855ba8150d
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 18148 bytes
SHA-256: 36559317cce998cbcf7cd318fbdb4f3b75f6c7c4e709a125c6863b7583455658