Malicious PDF — malware analysis report

Static analysis result for SHA-256 d767ddf4ac79e866…

MALICIOUS

PDF

78.1 KB Created: 2021-09-09 18:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1593375fac4bda0ac68699bdb766dc4 SHA-1: c0b0f937dfcbd66c9c77957a15c2beca400af0e7 SHA-256: d767ddf4ac79e86660d950c722338eac18e44c7affcfd7c0a1ae47c8c88f14b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://marchmontnews.com/imgs/file/mavakuxalabapo.pdf In PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/50647127368.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2fc1d1ee---2945213360.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nm70098i2j8dp4b5vi1hvtv93f/vugosisizatutesusobekeb.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/58465365329.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zutogozezebonelabum.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/fibenug.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9bva897omtju6sjvt7jkl7s9bq/jipuzalinabivapalazugu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/razaxu.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jikapix.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/gifazexabomusumimurir.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/89970247658.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///pofuxanimugoxulebuli.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/39222243277.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/gusadadozevugobugaxep.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/16684815578.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/dubagezitejimuw.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139993689f67---46168247437.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/rijopagive.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/sekal.pdfIn PDF document text
    • https://kaimano.it/file/zexulasozawadino.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/99919327215.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210906160257_i0ycbu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+every+body+is+saying+pdf+free+downloadPDF 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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 18132 bytes
SHA-256: 83901c8fa25d7c51d7e36c2fc318744d585454fe8f1d95701ac4fce3bd697476
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 11176 bytes
SHA-256: 093b50560ba675978fe7a24259b075538f6a3a87d81b68c644c1769482108a0d
font_02_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1