Malicious PDF — malware analysis report

Static analysis result for SHA-256 1109b175a59a539f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 12:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15013fc877c1a9683edad599e7ec4d98 SHA-1: 9317e24daf4c5fdf37ad791fbaa8f6b0b313e5b0 SHA-256: 1109b175a59a539f18fb07e0a067852e1a9ea01b6d4c42c404d3999af1abfe90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiotecnicoarduini.eu/userfiles/files/jebabu.pdf In PDF document text
    • http://0vote.com/ckfinder/files/47091702432.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0338fdcd---venija.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/30370716604.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1116847a1---xufaxuwikawevazen.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161332c76a1856---pebanodapigerawiz.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/69267238329.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/wizipefek.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/27526127232.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/kodabexevidap.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/24827357845.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/pefozaponamuzefudekorete.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/vawusoximutudiwipema.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/71480238668.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/negevatatipenaf.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/navepusukopaditafibizuw.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/84014098295.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/kefipebiji.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_94CE6E7AE18B8F93.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/xomiginisirilazag.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/nizalumofakutoxamunafu.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/98405651004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=compare+poco+x3+vs+redmi+note+9+pro+maxPDF 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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 11168 bytes
SHA-256: 934dbed67d3569d8d162ef495172935e763383f45b127192f3913e6032d57da2
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 19376 bytes
SHA-256: 83895fe03426de8f24ce286e69a4196e3e747e780b6eae0f76dd059258b3e08d
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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