Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50beff71ca2f5fc…

MALICIOUS

PDF

83.4 KB Created: 2021-07-09 23:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b589d28c8e6095af737641d79f2b0c04 SHA-1: 61d423043133b0f8ff2ebd252a15a894d1ab6269 SHA-256: f50beff71ca2f5fc5e24e811d30874ddcbc3caf7ce944f09be219a77fced6d42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fc315b5d56f7fc22c15683a7747c5856/retifejije.pdf In PDF document text
    • https://tese.in/ckfinder/userfiles/files/mifiwujetisibaduki.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/biwajolug.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh7g2o7jc3re6v1fpfrftq6li7/18991763506.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/14578365081.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/dokidelunewimidobirobin.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37b7ef6f9---80229393619.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd6f72442---zafufakoxiz.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/15529530292.pdfIn PDF document text
    • https://tch.lu/files/files/42013899706.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/32915656132.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/54399489546.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/4577406035.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/70407196266.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5f4cde8c5cdb0926b8dfd30a48903076/palajaravijatabubawu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/28f74310282452bfcf8b32c146ad102f/3831618075.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/3621f3c211a59d54750edb228a8d64be/tevubigeboj.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/73920296486.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dp5d0e2601hr8gubehtdg66qlv/45468954033.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/9f7ea62aaca87d43e361645c7bd4a09a/kalufotegorawagaxabuvaven.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510201553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=say+what+you+mean+mean+what+you+sayPDF 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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 16200 bytes
SHA-256: 126f15bcc634542d1c36ad6898ae33d3d4a7b8c4396aa24ba5bba2cc3cda0701
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10512 bytes
SHA-256: c662310fe31ba00030116cd5de307490b5d6a2b6e4ca3232a0696fe8137ee94d
font_02_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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