Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce25928162fb90e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38d1eba62bde0878fc40b4854c7146d5 SHA-1: 2b9bc66e6714d985683ec5ec04ec81a16c48e356 SHA-256: cce25928162fb90e7d721fca8d3050c7b3286ca1252ed515e4a05fdaac5d7f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of these links and the overall structure align with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e166179155---68357018377.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1ca47667---maxexowidelurixo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307aa374076---15854053133.pdfIn PDF document text
    • https://pr-dienst.ch/file/mujamipesujebizavaronowif.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/faxixafugalilubenu.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/25483577282.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161317f1dc261a---13221235683.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/56167812854.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/jumususalinutigiso.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dikas.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/jaboluvaxazovuvepiba.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/jexapaz.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/jovomuxusasisivodine.pdfIn PDF document text
    • http://forti.in/userfiles/file/vimapoxofum.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/nomijuzumikaturapulodaz.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/naxexuwora.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/8785689256.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ramidufezipipo.pdfIn PDF document text
    • https://beautydent.hu/editor_up/jofanobol.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b2fb89ecc---28162376146.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/33128966084.pdfIn PDF document text
    • http://maksimetall.ru/files/67169921989.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/72680932653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=resume+sending+subjectPDF 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_off0000bdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 10700 bytes
SHA-256: d7c40b860c44e5fe5fbfcd2258cab8e4a2dff429498200a4286170f54a9dbfb1
font_02_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 18092 bytes
SHA-256: 8bb01a656a397e76bf7d93b3e5746dd090ec33d2c274f0b39be94284c69af71f

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