Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9bee3ff322c05d…

MALICIOUS

PDF

96.1 KB Created: 2021-07-23 12:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 526e942bc4e53fb41f0e2f60a90088c7 SHA-1: 55d815dbde4b86b1b2f518d5d0827face0d8612c SHA-256: cd9bee3ff322c05df765ce03bfe199b23044d75579743b76353d75f7f74373f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://acquadiqualita.it/ckfinder/userfiles/files/10891500600.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df6410494---29234419572.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160800a1d56611---jupotemifofikuxutatej.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vasuzopopexepunenamulox.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b68478604b2---boxofog.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa60935dd5---vukux.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8a8a2a2fbe9e704787077c9486980b6a/towakamidazepazikodukifo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/da1789c1bb59a61c1b2e7cc9dd3c51ca/897887958.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ac9dad75b5678c94823e94bd91af3d53/bevovekuva.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/2819395413.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/mifamanemetowaze.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/51798857869.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5062b3c1---gegixaxorawozeparuri.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/18962321816.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2967678667---gazasalubolexaxavawa.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0e304ea24d95c1733f953ff4c0c139cd/wefapujefexebijelajabub.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zapep.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c3bb45107f7c40d4e4384aa6a2682aa2/pumaxoxawazetaweboxetutu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc40efa35.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f36be664---rajezusasapakedo.pdfIn PDF document text
    • https://melz-feu.ru/upload/forajujig.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1bfc8b75---23167845849.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/bukoreledag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sequence+questions+and+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 10976 bytes
SHA-256: 8f52c9ac4b0bb3f0a00c86c6e1ceaf7c2280af9e598bca92c70940e8edfdccac
font_02_sfnt_off00012ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD0 17916 bytes
SHA-256: 2bfe2ecb9017c07f89997bde329293a38e0b51b09ba708083f787135344de455
font_03_sfnt_off00015a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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