Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6295621dd5bc7a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 12:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 511c0bbb4c35260f4b5f1c873f2e9fb4 SHA-1: 3dbcb2f5394c98f83bf965caf19b4a2e273bc1e1 SHA-256: 9b6295621dd5bc7a6f4242200ddaeab67260190799962ebfd42e03d762f2ca30
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many external URIs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable domains. This pattern is commonly used to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cailux.lu/userfiles/files/wusak.pdf In PDF document text
    • https://maxflowfans.com/userfiles/file/jugegelu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41b3e34da---5570474200.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vufinedaxidux.pdfIn PDF document text
    • http://ativn.com/upload/file/fofawumidivasukir.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nixaguwujopi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/95b5188c7b834c21c8eb9b7cf4050da8/resosevegebotodosedivu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zupiri.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sn739nldjhs9kvtefn3pg1fa43/teredusex.pdfIn PDF document text
    • http://dalaichau.com/files/lurupiziriw.pdfIn PDF document text
    • https://artenika.pl/fck/file/78306645157.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/12605584743.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9madpjqceca59017076t8q5qd3/47743084099.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/netox.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117f58fb74be---15368685648.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc52f52e42---86783211124.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/63701492816.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/39823453088.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/88846192849.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ubj1lq37lkpnalfbvmfcg67a27/81037952857.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/mijux.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a837e9cbfb561d0fe554cef0ed18056e/1289743544.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/mojaxawafur.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/18846284225.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/soxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=instrumentation+and+applications+of+uv+visible+spectroscopy+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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 17332 bytes
SHA-256: 9fb75d679818e8706e940eea3e82947a4944813efe7cb01a92abf2bc1b3422b0
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 11152 bytes
SHA-256: 2c7ce313ff8f34e4b365ce9b33aecaa02b5f401421a5728776f29207d0afb518