Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede91dc04b0fc7cf…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 14:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cec0a649d3477b3b9f134696ca2c2763 SHA-1: 1bc20d2057993df5a388d20fb748268990df173c SHA-256: ede91dc04b0fc7cf3d08c0e38b7b3cb5eef002d0dd12550b2e47bdab8f5d2757
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It impersonates a cloud document service, a common lure for phishing or malware delivery. The presence of numerous links to external PDF files hosted on compromised websites suggests a link farm designed to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfeb184bd---82193333254.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ce65c5ad7d0b38b301ab722eb667efcf/nopirux.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/wobunoroxiw.pdfIn PDF document text
    • http://learningkey.org/userfiles/46665658769.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/95135601284.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/1fa02a9a2fa49c62e1b8cb06dfa164ab/venimujoregixigezubapini.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/belitozadigol.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2ab016d78e90b7970412d68dcd7902c4/21088536321.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/gutugafamepizokudatutumi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086e12bf418d---wumakiwitibivalodokiraje.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/35802068188.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3j5nun5seu7t3fcr5krpv540u2/38970556598.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/70837632238.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zezapupusujuwuvuji.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/38946153549.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/17e33b1daade66db06a5fd94558f290c/70748112863.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/12518096719.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e77b59a7749---45957751376.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc12e0ba5c---jakafepebojawewonosabaxe.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/45694037050.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/sipefevebekadovezuveku.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/feretilobowaduketun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+do+a+word+count+on+a+pdf+documentPDF 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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 17032 bytes
SHA-256: 007e2ed9b6b452a228a3c6f7e2a7674f107fc3811f6b8a6b74fc52d982b10772
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10804 bytes
SHA-256: e4f564ef4a53b53d9c1a85722fed847328563c54ce59a1943632c2954a3cca77
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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