Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb9c840464b5456…

MALICIOUS

PDF

147.5 KB Created: 2021-07-29 15:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50757edbfa7233411425d3f3dc35ffbc SHA-1: e0550d8cb3d0c67ff4205dbf77fd9f3525068642 SHA-256: 2cb9c840464b5456470d4cc0c59d6bb33d4dec6b6651b67515e6759d1bb5c479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, 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 embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://micronforgacsolo.hu/UserFiles/file/81900368187.pdf In PDF document text
    • http://naucseto.cz/storage/litetudoxiti.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29f30f12099cc8f8faf3456e8eaf7c2e/31946408915.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/967f283a9fa2642e8d6ffe4fa01b1028/18789885218.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/61037731674.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a56e7e53---kisetavo.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/24820818693.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/kefapiporazipawi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e97b3e789---tiragaragamaxamax.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8707acbe7---sosogadufarofow.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/fivazenopawinefed.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/076523450f2e799621efdb45222e23ca/26566159886.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2852f3af09---zilobatid.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/kinubopepusixezido.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/55272854529.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2327de8ea3---87663247381.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/6590890896.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a458f705617---gurig.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210702135542.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671456bcc9---panewekugubarurabegovim.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/nbr0jiorunod1so3rb45r4afht/kezozifunirezewenugoja.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbec92ac4---17480255973.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94efa86be---66080912830.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xigaropafus.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/pasideziwam.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d6095852---xodogupixijetu.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/15603442531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=probability+random+variables+and+stochastic+processes+4th+edition+solution+manual+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_off0001dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAD5 11384 bytes
SHA-256: 0e0c155554f39317a6b81731aeac9797b3f0caf7f6afd4560983c0e98917affa
font_01_sfnt_off0001f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F54D 18156 bytes
SHA-256: a1391f81a8faea07b64bfab7c48a40eb72f8888dcd30f477ff75708bdcb0b1c4
font_02_sfnt_off00022436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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