Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed3a3caa060a34d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 19:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 031a0646563cabea7082280902a2ec95 SHA-1: d8e405c7594999dc8e85679b860759c52017924d SHA-256: 8ed3a3caa060a34d2a0ca7d4c127707faf0ae8d8b4a74e0b142e170fddfbbb3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of link farms and compromised CMS upload paths suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=jesus+alias+el+cristo+pdf PDF link annotation
    • http://archetipoingegneria.it/userfiles/files/lajagenobavegosal.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/bevasaluxupegakebob.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cc7167e13d87e2746338aa88863c5e1/xejotuwegoteg.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/49942333316.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wosonikesezuz.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/12559363784.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/92756472034.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48d16705e---14165011339.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xupazogadegevelufo.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/88456370236.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/busosowaxoxamenure.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/23363316049.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/bevixalijotemamirogigog.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/fatezeno.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/7835906119.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210920072551_uuzgcr.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/96317517926.pdfIn PDF document text
    • http://dakov.hu/_user/file/zejenowusatamagabosuvuxap.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/jogasufagixilurererakavix.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b1bad8e5c---dadaduko.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2d5adceb6368884781116f67dadc9074/vukugaregalezuli.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kozefibowifarud.pdfIn PDF document text
    • 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_off0000bb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB81 10600 bytes
SHA-256: 8d737901d443b003cab050e48dc560009ec3501a329b7e9a0c6cdba68c1529f0
font_01_sfnt_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 18180 bytes
SHA-256: 1a261da5c54b06467d81d39acdff61098fb5399f88744cf82ba6e0273d235a07
font_02_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1