Malicious PDF — malware analysis report

Static analysis result for SHA-256 e713440c5ec73bed…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 14:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afb121af071d1a2e325823f9a0657db0 SHA-1: ae384bf49baae810b8fd003003fc26d7af3cebee SHA-256: e713440c5ec73bed9f039f657b28cc08db80913e156019531cdfcd8bc75cfc7f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://datajournonepal.org/files/vemepipizejuwofasij.pdf In PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fefikuvinadowu.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/vajafitagutitoso.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/jisemese.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rpgk111ilnc8jg5foode96gojo/patesoposugamokajir.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/92589356461.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/niwewotare.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109130718305738.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/61574238049.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/47654196782.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/genozixijefupasup.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/walotoxugobejanedi.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/83131795008.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/jeraduz.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/46878909173.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142cfd4849ed---kobuzofamefofinasuta.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/88625104767.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xozugosawe.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zalitedem.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xoxasuvarewiliwox.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425e016b464---38158657274.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/38449019224.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/33930555045.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/22495677280.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/58238080376.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/roninapapojubamuruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=daily+data+limit+androidPDF 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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 17872 bytes
SHA-256: 5f6b885e487575a3a30377fd278ce7b28807fa52f8a185f3ab26e51fd203e3f4
font_01_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 10224 bytes
SHA-256: badf85115ae9c598daaef039b49c53ceb22d34b65cd1d64623bba340a87bfa06