Malicious PDF — malware analysis report

Static analysis result for SHA-256 422dfd19e06be315…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 00:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06cd7f7b27a671a08a6cf07e1bca614f SHA-1: c9fc16f0a2671053c8a74e8f4e4938ae573cdd08 SHA-256: 422dfd19e06be3151ab26ea02b1f9b933cad796d686b139224b6c6f5b289ed2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=automated+testing+tools+for+android PDF link annotation
    • http://www.binghan.my/userfiles/file/pasaleriwig.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/suran.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8dd56e6a---45146412948.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/xixiwig.pdfIn PDF document text
    • http://dasbluemchen.com/vovadexerufezetipun.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/71825601673.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/44721782333.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/93779841514.pdfIn PDF document text
    • https://wittnebel.dk/file/zejedekedetetifosugivu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161410f8ce07ef---38359278848.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/9564651485.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/54568284136.pdfIn PDF document text
    • http://kccmaul.com/files/files/95717360889.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee8e8dc3---losugir.pdfIn PDF document text
    • http://anm-av.de/uploads/files/19498102048.pdfIn PDF document text
    • http://thongthien.vn/upload/files/99671674263.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/90897746686.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e61f3a1---64651310092.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/rusegikasu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141111367a63---kunosizexizowib.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5518775643.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/445d77304a28e1abbb8048ab33ea630c/72541261737.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/jofewugemimapajamujekubi.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/gaxixarenu.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_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 18088 bytes
SHA-256: 62c6c953e80ef8002dc1248aaa9f593cddca872da856371dd7b5c74b1dca6c13
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10776 bytes
SHA-256: 220a55e885411107dde585b4f5ba26a126594631fc2e6e72093b5fbc27122d72
font_02_sfnt_off000124f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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