Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a2dfe1c9c8cba6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 02:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ae34ba0efd566dd2439403799884e76 SHA-1: 4974d829ca4696525a86c6d6dbc5bd0f06ff2ce0 SHA-256: 23a2dfe1c9c8cba698755a9aa3e4b4b7dd898e33f662f98128adcea2de481fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs lead to compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://wastran.ru/uplcv?utm_term=shepherd+lab+mix+puppies+for+adoption PDF link annotation
    • http://nothingelsematters.net/pharma/images/files/manirove.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f202070a4---farotezofuduzerebasaz.pdfIn PDF document text
    • http://wohingltd.com/userfiles/83256491301.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210530_772D3CDDC6F19C0F.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/34436590978.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc82a297482---wilobigo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06d27f7ac---50136078682.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020148035594.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081395198d1c---witeli.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/52539962328.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210626065815_m4g1b3.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/66157936452.pdfIn PDF document text
    • http://jaika.in/images/documents/files/godinoponusijaripiwisaw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ef0a46e3---julomu.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/17612911761.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/44184094371.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/97623222474.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de4650d711---42567260977.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ahgksbgaqvaja08ovsatv3r8g0/68782274472.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d2eb60e8---22936340501.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ropixomavifizituwizo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/16354511169.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0294c695cba5e3cd563f07c83eafb8b1/3511077112.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/75585074794.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/50hj1rvbqpluudvm9e5gtjfp7q/24114178323.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_off0000bb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 14924 bytes
SHA-256: a68085664a711008d63138ba176c4dc23dad46e44e4237c23de795d5e283219f
font_02_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 11180 bytes
SHA-256: 425e9aec6165424e46e352892e71e6e4d5c3b1c3a2ae8a871e22b033c74c1310

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