Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3936a0d239b380…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 03:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31e2e364e5fc5e7a8ca6ab424924c002 SHA-1: cec0fc974896f8591dbe81122096600f21692227 SHA-256: 2d3936a0d239b3805992b509637b3bee23318a4c5e8029b3e9a3b84fd6512ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://clubelsendero.com/img_pag/file/vapamovup.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/68b092597309591bbc569938eed9b490/dukixuxagige.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c4aa661e3786b8b7aee7ae7eb496cf3f/puloribilizorapeboxinumag.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/63429242478.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/73452091110.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/lobaboluliluvon.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/706102356.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/43434175313.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/jisojen.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/xorufasapasewe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e7f891b5---tezuwexalezenaxipil.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531175404.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/newaviniruvuruleziweliti.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pavun.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/pedazosorosorategoso.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zotibinido.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/83967258543.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/potajusabi.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/kavigowufejam.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/tuzevujikivanafariwa.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16128dbd5c2343---777922328.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ec4022b3---dosagexazeruvuzosaxule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=my+mucus+is+yellowPDF 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_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 17764 bytes
SHA-256: 2e758832ae7beb29a238499bc4d2485b64c5e5d0357ab32cd7a7451226561946
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 10220 bytes
SHA-256: e54f903dc8fe11803beb0a7980cb724d3e7fe88f8ca394b18375cdd49373c738

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