Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cadc8fc07935d0…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 07:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 517ebff4ab10b2e89645655f518b6ab8 SHA-1: 5bcab3a3e33248bc99698ffb8f6d70bf5e7837c2 SHA-256: 16cadc8fc07935d0a617a41ffe298def4be62b31452b9dbcdab68e1a389f8c3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://ketchas.ru/uplcv?utm_term=movierulz+mumbai+saga PDF link annotation
    • http://ff-engineering.com/userfiles/files/wavuluruxezovovukejij.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/63319783506.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/begezemunafakudobove.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fn4mdfmn8mi5d8pg48tc4mhibu/23156434510.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/medelafuzusenid.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/sirunaleferojofovalu.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/1945012383.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/80899595134.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98ddb58a1---filuleganemu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/91183428018.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/98829084903.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/67100313046.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/80388520889.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/42779203239.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/85615718182.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/gazisaxukabanamozam.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/18735020300.pdfIn PDF document text
    • http://greenld.com/userfiles/70374088186.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/87916738495.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/95b3014b78ed7f05f288389ab92faa4d/87450278265.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/kajakonojazakogivopuman.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/58995467634.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/ziserimerusuv.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/vufugemaw.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/rofapovanukajazasobotiki.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/33369883418.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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 16432 bytes
SHA-256: f73fe55fde45faf9ef8d2565a56dc75dab1ba63c2d53f5e5a06f9f5eeb9cfdb8
font_01_sfnt_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10608 bytes
SHA-256: 0a048fbcf546a6baeb4963964e5df8e4d28349a1beca34b40eb1786d9b3a7302

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