Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57f7c61c0a74c5e…

MALICIOUS

PDF

85.8 KB Created: 2021-08-11 09:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ad5325da6d4de3e6c037127adaa72b7 SHA-1: c97313b324c463197c3ac33d8969d0add1bf9d73 SHA-256: a57f7c61c0a74c5e5c20fe1b21b38b98624695e774bbb5a58418fa99df39a129
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into downloading an encrypted archive, likely containing a secondary payload, by providing decryption instructions. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, indicating a distribution infrastructure designed to host and serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://temple.mo/userfiles/file/kiroxanuruderamojitu.pdf In PDF document text
    • http://umrllc.com/userfiles/files/82266456115.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b17b136cf2777a7d4375735504323177/47412503273.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795a0d1ccca---riwozizinivubajevem.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/29671272954.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/2044946501.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/h6usuf9a114bkj8nv1vv4l2nv4/6671519535.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0875113e4c---54170435944.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/seludol.pdfIn PDF document text
    • http://chpcentre.com/files/file/minukebezepojupuwon.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/c5dp11b9mabunmv15qjhal9o16/76473945001.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/71344050135.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd858d9a06---bijirexexeve.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb191bcd7---43761709561.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/93255037058.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zanagenopasufutu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b7458f4c598c03ddc9e178440824578/jarotow.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8a474e264ae805bfc1a66d09cc45b0a3/daxewuf.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pudoserar.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7c8160ff---19578885606.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tafezotiduwuzumefujotu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/27ea25e2aac9a6f3e489d63c08a43f29/6769263512.pdfIn PDF document text
    • http://cochu.net/resimler/files/fevikipagafamoputi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tkvpaluiu3i7i9j28uj1j2ck5n/zosaguna.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/4562229427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+download+adobe+illustrator+cc+2020+for+freePDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 11028 bytes
SHA-256: b2ee3cbc6e3944d52d96ed668944689567bb79e30e6cb47f89e1379cafcf1efc
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 19988 bytes
SHA-256: a541df0c5416af0ae27720494750a24f7b0ebc00ff70fc0186de6ef799b0496f
font_02_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1