Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff86b9a704c836d…

MALICIOUS

PDF

79.8 KB Created: 2021-10-15 22:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f8e87694736c155394aa8dabf2fd2d2 SHA-1: 6ea676a113da32a38efa82026f47ccfa27d3fe9c SHA-256: bff86b9a704c836d95154650e876e409870f0861a590fb2eb3b7363377e038ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://adance0112.com/upfile/editor/file/12099807817.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/plt0gq5hgb83tnhd57gmrcv225/butulutejufax.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/5746928079.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161414a2845c2b---31565460189.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/93791368659.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d03c8e9f7---63033871846.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///57239975070.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48857235330.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/74608144545.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613df41847025---jufixukisu.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/fetususejemomu.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/33633656554.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/dawolasikidu.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/18548489210.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1843b744a3adfe1fa77f080ea973c7e7/72529894281.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/42328018805.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/75034308736.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6a099d7d045e834bc9bd596776bca73c/kapifajapirorut.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/18738823064.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/66239482769.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/31458622646.pdfIn PDF document text
    • https://tpk-m.ru/files/file/kamakotakejifit.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xadapanedajiju.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151f5e7ed535---26108221141.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=i+have+to+take+a+showerPDF 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10156 bytes
SHA-256: 14e4a4c484e4fc2028a296a3dcc912467ca99a4ea2a6a823fadbb9dc9802c001
font_02_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 17104 bytes
SHA-256: 127bfaba188aae8c396f3393b152220b35c6c1cf3b0ab93819ec9411fa251c9a

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