Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23942b01bda0638…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 13:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62326fd4dabf5d710007aa5fe3052390 SHA-1: 82d5e4a04d2cbbfa09289fc17abc47a6e8a14d13 SHA-256: f23942b01bda063875b3ebf9be732229f08b4445b60f49efac045914d7844781
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://adaviestransportltd.com/userfiles/file/kaliripeza.pdf In PDF document text
    • http://geometrarontani.it/userfiles/files/45801177340.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb7145483---nikodonovodu.pdfIn PDF document text
    • https://zlataraburmevuckovic.com//files/virewurulonijisamu.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xemuwiziduritafi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/409fe1f2008d8a4147cd16ad0ced1bf2/rojixekaparubedaw.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f0c2a926d---98203088531.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/69822159536.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/80289500612.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210728144605_0b5b7d.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nqubkgs0e9jn5j5elr7embhs7a/19191006156.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/50572592056.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/43753465534.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608416aa6a97d---musutetakoxufufu.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/21539734704.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hircsffu8bp5j7monhm3o4agos/luvaduxarevunogi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3cee504b504c38acd22d1526777880e5/sobafezifeta.pdfIn PDF document text
    • http://digireg.com/upload/19498121796.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/72490329122.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6fd1632b---jiletuxefifukifabal.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/66154396838.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/javopudopafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ingle+endodontics+pdf+free+downloadPDF 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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 10832 bytes
SHA-256: 71bfdf5a4e612a8955afaa6fd58ee35862202ff746359ccd6ed417f319a67961
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 17368 bytes
SHA-256: 9695379fe7b6011193213bcc1081c9a1c1be82f83c420bdf276ab53e82d52c95
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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