Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d549ddd2396c16…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 08:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c024faf163a307a8fb7f211317059c6 SHA-1: 06365a0fbf83858ff52396eeb630232c07915fab SHA-256: 47d549ddd2396c16a77e650c7aeab0d909eecb0680c72ae2ed6e40eac58d5ef3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/kvoghp3d0immabg50p1q0ft38j/bajelawitaxejomitukajo.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9fd081aea---xujoxulatopodarekotex.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/vizimobuzoseganomegawa.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/62199778826.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081423096d49---4442668736.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a2faef0b---38984658360.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b5e5ae094fa6ddbfd4fba91661758f4a/mugoteramijid.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/js7onsp19bkjg2tagc34vejaab/xoturakosefupa.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/49995638212.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/wanerowozebaxukosu.pdfIn PDF document text
    • https://amblamy.ee/upload/file/47834781710.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kabagujitabolat.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/munenetibirawadidasugami.pdfIn PDF document text
    • http://fygl.net/uploads/file/110709297470.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1f37cfb43---difipogakoxam.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/sakuritofuvazakixuvi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f51f646a009121b1668d1340094f738/8056207872.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5b60ddd17025f36d8b864c0b5128b69a/71369748469.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/63d63ab9cbabf43b9442582407115c53/wopiliv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797baf672b7---batunitumibarefolive.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/kuloxefo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ef081518c4d3d1deaf6ddea4a726dcaf/93883589939.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae33aebde8---27561678085.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/136434375260cc5d9d136ca.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/39538445302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mca+after+12thPDF 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_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 18080 bytes
SHA-256: 13bacfc01791dc91f6e53b66fa8e2cc3167074e5d8e0a19a51c5f2563af78eec
font_01_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 10068 bytes
SHA-256: 09f1997db86d9eaa47232ca252e5a43455d2591386ffa6f28ac5c49afa5833df