Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b0a12f2943ebae…

MALICIOUS

PDF

69.9 KB Created: 2021-09-07 18:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad2ee4695fc6cdbc79c04aa9dbca1df7 SHA-1: 51f69ac90a6042cc5911f1480728155dc2084951 SHA-256: b2b0a12f2943ebae820a4872201aca12796cc68c1b52aeb47bf9b22ae2cbb917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms. The presence of numerous links and the nature of the hosting suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://villaelen.it/userfiles/files/59016294648.pdf In PDF document text
    • https://africanresearchcenter.com/userfiles/file/59902321636.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/puvoxetedomuxawakupuwosu.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/rakuxamexowonelepuxivujif.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf46dc219a---xomumedezivezuf.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/78831910919.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5539c7434---ximezibigoze.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/todabapezererabufekefu.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/gajujutekolifepoguratuni.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wubajonemenesozikixapara.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8420613c23ac388482617891490320ca/10944027761.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/wovijuvitijujozabezabit.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/16977688935.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d37fe8cbe6---86313102375.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630555832.pdfIn PDF document text
    • http://nfc.soo.jp/file/joviva.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106edb10454c---25559022890.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081563e4c3bb---wibituvevugufirumiwotebe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7dab33c11---ruzigufumobezekumo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/musuwoginuvazigami.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/pemitupumuw.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/11085016690.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/85222215526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=convert+pdf+to+html+with+css+onlinePDF link annotation
    • 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_off0000b34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34A 14916 bytes
SHA-256: f91e9824283a3b593b49667337ac2132322260b3f68450b8fd4f18ea49c0a1cf
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10904 bytes
SHA-256: 12be04412b0d80d45a2cc0956b6d4408cc0d0f368476f7de44236acad603aa73
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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