Malicious PDF — malware analysis report

Static analysis result for SHA-256 90276c680475d470…

MALICIOUS

PDF

70.0 KB Created: 2021-09-17 08:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19fea0bc514bba97bbcf6786f1f4af62 SHA-1: 5c7ff72f056b1f011661ed98caa0b158751fc6df SHA-256: 90276c680475d470a35b337ffcb6de4d7985fb8e0658db1795aabd6f2f8c8bb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, 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 link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=photo+editor+2020+apk PDF link annotation
    • http://clubselectionvoyages.net/images/file/42147016865.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/64892417037.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/xopeda.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/13452049985.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/43478915807.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/95583872343.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/ponobegadiliruxesezitu.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/natokep.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/87122806467.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b64b17431---3795377224.pdfIn PDF document text
    • http://makaroma.fr/upload/file/xuzobejoxewopokisufovo.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/86013825806.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lomedozemubuliresifatol.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7193b01---nafevujagofilaneber.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zakedofasexibasakube.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/zejukadoduzeso.pdfIn PDF document text
    • http://sksound.com/userfiles/file/99905482066.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/951e421c931fda7b665da5cc85e6a98d/ralonu.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fivalupidopuf.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/xebisavake.pdfIn PDF document text
    • http://modern-pro.ru/files/file/50812313957.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/21170994003.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613925f007074---54713009643.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/15369446255.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_off0000b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32E 10504 bytes
SHA-256: 853aa201cd214afb5da92d5370fe08e78062ace8feeca08ee37bcac2ac380646
font_01_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 15792 bytes
SHA-256: 330b93300591dad2c69985fcb00fe1a5596dfe3436d067f742458c9723e484e9
font_02_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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