Malicious PDF — malware analysis report

Static analysis result for SHA-256 3964d2ab12e7ae84…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 19:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01d7121d31774be647289444ccf8cd95 SHA-1: 44dbdce15811484fc5d3e3270b228fcdcab66d2c SHA-256: 3964d2ab12e7ae84e4c830eeb177e93420659f729037277c1409f64b3cbdbca0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aggengr.com/uploads/CMS/file/seforog.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-15/20210615182858475431.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f881bdda9---10881927751.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/17803804208.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/fufexu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/11901816015.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cc130f19e8491a47112a73cd96a5b80f/ziwadoxuxede.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/70933675161.pdfIn PDF document text
    • http://keluargamimpi.com/contents//files/xixowitederelojukijelirag.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/76867065109.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/bejisen.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/53634379100.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/xefoleboxotulipupasuma.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/likipox.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/lotafin.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/34de241f41ed7ad39f4b4049d88bae68/koralaxepowew.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/jigulomelijapika.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/6577757365.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7742bd4bab---denerekajodilosorufilobap.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rv5bp8f0f6mn1iu8i7afjenr2q/42433461507.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/20197b10116b1383ddb6ec11967f7b16/gapakebovoluziguj.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/96599011898.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/60452456514.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ea600ae4b---dogewukixobiwibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=99+names+of+allah+explained+pdfPDF 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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 10740 bytes
SHA-256: 8f363577767d69a96f56ded51af7c1c17a0d35bd2742cfb57075bbc1ab183f82
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 19888 bytes
SHA-256: 78af0d9933336300393041a552d6ac3199aea650eb46d9fd237695b256155c79
font_02_sfnt_off000136cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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