Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3317c0874f15fd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 00:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c01ae834d582324e31739a540f21b6ee SHA-1: ba89f4c7a8144101a5932c5c17d27530fc1c6bd6 SHA-256: 8c3317c0874f15fdfd0ba31be1a7eafabd24b1c4870b1df4ac184c4dc64a2dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=flash+porn+games+for+android PDF link annotation
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/gevurufivi.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210912_B68297D9E33ACE24.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/varosagug.pdfIn PDF document text
    • http://www.toptehnik.si/images/sajafowobenotizojopagiku.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/79770233527.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/52942284714.pdfIn PDF document text
    • http://juncheng.tw/upload/files/9245076342.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/lisedolorodurevuligovox.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/75036410289.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092219192123.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/pufizokutedozig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6886db26---bugomumagafafinuvi.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/75186446561355001859c6.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109052256558042.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c8c0be65---17045120557.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ea8a6ee7---neditozilalazinikazowepa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8fe7c66ed---91661409344.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/laxadodidamo.pdfIn PDF document text
    • http://bdsductri.com/upload/files/65715748029.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/tipirizekiwirolizufed.pdfIn PDF document text
    • http://livestocktool.com/d/files/605077727.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/46813347445.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/jopuniwukibo.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_off0000aef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 10824 bytes
SHA-256: 93c614aeca0ab6d5638117234952e7d7dd938c9b6036901b2c3239e6d22d9ad5
font_01_sfnt_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 16532 bytes
SHA-256: aa54410bdb081a37d45a33ada874925128042401a27763936f228e2d5c9ba50a

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