Malicious PDF — malware analysis report

Static analysis result for SHA-256 8140673c3e999ed4…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 08:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fbc5b21d3aaa62cc590b950553c0ca5 SHA-1: 55f4d1c3c310adeaaec9ee612b2ec72800e49acb SHA-256: 8140673c3e999ed486988b4ffe609acb5d78541cc6e415b7d59d41c94c7b9cde
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b143b5c00---tomezodoxulakagezofo.pdf In PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/67653302297.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/notupibu.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gizekutesatazevaxelula.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/71865504393.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/wemoboxikelaliweduvirib.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/76424462229.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/jufufotumewobojosadedatu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/02bd1448df2548464276f923e6f58a87/59964146782.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/32894269441.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ebda3de8a---vitebudiwimemawetineb.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/43712558630.pdfIn PDF document text
    • http://mousike.it/img_ins/files/730043308.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/h7p2hn3o8aesf9osl0b7ianl23/97134320150.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609222b01cb5e---zinovaviboz.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072dfd085145---puveduzojusomuxudimero.pdfPDF link annotation
    • https://pemaboutiquehotel.com/assets/userfiles/files/pijuborepekesaba.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/ridobuxug.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a698d103f4b---37445072119.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/jovulelutuweri.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/133d33cef39d104208710cc8dd50fad8/98551842899.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/80432126880.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f6b9353a---gafapimemajerizolenukaj.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0acdd688fecc7b998ce8d4af1cc27823/26907271145.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a53e8770---zulog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hisense+hdi-100+remote+control+manualPDF 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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 17376 bytes
SHA-256: 0e91fbf3c6bb3e77012816f7d5d3af2a23c7b34319ea32215602b4229e3c415f
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10936 bytes
SHA-256: f640ed4f68ce034d86a13f7f53b4a7044f570855e8381f429a7a3d364e266217
font_02_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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