Malicious PDF — malware analysis report

Static analysis result for SHA-256 e637cc73d6333fa8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 13:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be0d4be9ddd6f13058dea97358a4be7c SHA-1: 268d9c7b1bfa233a3e8f23b84f1bfcdfca166f77 SHA-256: e637cc73d6333fa8056410ca2ec9f39f34d179fc36d70f0f0eef35ba539025b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://businessvaluationapp.com//fck_files/file/42634617488.pdf In PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/sulakisoba.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/27568681417.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d827bd2ba0---balezo.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210815160650.pdfIn PDF document text
    • http://vo23.ru/upload/file/jamugisodipuvavi.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/fupalolesamumiwupuz.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/77008183017.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210707033302.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/femigulejipapigivifesaw.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3fad4d508---41867738258.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fcae3b9f---28533751420.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/wixanasemopizipededojop.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5d87daa0---6515876442.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kafuzovi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4e45196e8b1514f8c4477f502a94bd23/54917574770.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36fdca8348---94975376143.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/045b575311be8ba0c30476cef317c441/93486661636.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/xadizodimulaba.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160740c84a87bc---86872441805.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/fofukubavilonu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/k7em5e1ijj5tr62gcr8id2boe0/38292443478.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/77321018364.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zebikemuzopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sun+sign+scorpio+moon+sign+libra+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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 18520 bytes
SHA-256: 81ebaafd64d24ce658261d0f810a41ab3d14f6f77b57be5aa5dbd1921024baf5
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 11048 bytes
SHA-256: 09a49528e883a750f9097c30db86dd6fa4890eba826c4dd37b18f756a104ddae
font_02_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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