Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd38caae0756801…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 07:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edf33a68885db4ca37dee6ec5881e1d5 SHA-1: eb7d135aab24fa39ea9674c5ed9fb4a4f785cecd SHA-256: 4cd38caae07568018c69ff92e4e94c2db55ee8d4c58f92db7e9c03703e317a29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=play+madalin+stunt+cars PDF link annotation
    • https://aydin-elektrik.com/resimler/files/1120725915.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/raxegametananazijosurak.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/57755670012.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/muselivu.pdfIn PDF document text
    • http://henca.com/files/details/file/23453256214.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/wosidupuvafokozakibop.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/sovagefujudedubepane.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/53877508524.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/92901808423.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/7195014773.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/polabag.pdfIn PDF document text
    • https://mmszke.hu/files/file/61586154552.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/vakig.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/jexema.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/zuverewulezatelutapo.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/22679261971.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/82582935929.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/66832490143.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/78536293763.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c2626c42---24062983020.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b8190f62c512fc620079b2c5042b95d9/vuvemumavilotufumetizo.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/gelitovibofuw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qf48lhbmd89oaei8lrkkf9flp3/17501448328.pdfIn PDF document text
    • http://hmed.vn/upload/files/81487422813.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_off0000b8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B9 10492 bytes
SHA-256: b9f4db01c93e2a1d26b77479b990c0ae1be5c130617ddd8e160b3ede00e0a579
font_01_sfnt_off0000d084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 15704 bytes
SHA-256: f6bba6e308041ce84d3a80cf68f8b0ba3c532ce40d2ec6c2df877963c9b14154
font_02_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1