Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a8de750029c1f4…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 05:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bced196adbc73cebfb63817c2d5a9dd SHA-1: 35eb960bd0b7c3d393d9d81270dbe4405dcd85aa SHA-256: f2a8de750029c1f4fef3a6671158f8274572f5159c29d9c17b0876c1e1d896fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://inwebjor.ru/uplcv?utm_term=remembering+the+hanzi+pdf PDF link annotation
    • http://hacoauto.vn/upload/files/jifitejimetibiwenagoso.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108311750466611.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wixoxuzufowabulej.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ogu4i82a2pubg3t2hl1mpl9tsv/ruroke.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/vukunapudalutunemu.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/42605411708.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/vositimafefud.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/57551779204.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/73619997828.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/4654938684.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/92543045794.pdfIn PDF document text
    • http://gibisch.info/files/files/mulolipizonarakej.pdfIn PDF document text
    • https://cape-electronics.com/media/file/lupagoperupajeme.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ff37a837---34156612531.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-3/20210903225119896985.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/31984261098.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/etqpa5e5clam757cgjjgteqbj2/puvurananukurujusala.pdfIn PDF document text
    • http://lg-palette.com/upload/files/tesozodamimapaxuparaf.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/dugogati.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/xolujinawak.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tosagunaxafurenul.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/73689591441.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/riwidevowotapidodeb.pdfIn PDF document text
    • http://mosjob.ru/images/file/29638444301.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/leterawajejetevabatu.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/kidajev.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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 21644 bytes
SHA-256: 355510dce9053cb65a4d687a50ce9f05a2d1d9c725fa26cc39ca55041cfb48d9
font_02_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 10856 bytes
SHA-256: 054bbfa41dd9f53e7ae83cb77ea77b7d13cc2b7901dc83a1df45a64f0892ce2f

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