Malicious PDF — malware analysis report

Static analysis result for SHA-256 11228f54dbdb598e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 04:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f3c1820e2e830aa7f7f680139f48ceb SHA-1: d521a8c2b89802ff80019efe9cbf82e0d2b5c94e SHA-256: 11228f54dbdb598efceda49a4a543dcb0e55d45d9f2a94ca25b181665e86e726
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for distributing malicious content. The presence of a 'download button' heuristic further supports the lure aspect. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baatco.com/ckfinder/userfiles/files/5387612951.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/lopavamerokiga.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916222831.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/311942834064682f1d396893d6d929a0/sakap.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/65540597811.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/6070000237.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/jegaluvufi.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/68875910266.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422591a7a99---vetizato.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/17592677450.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///77601604454.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5286b78367052b973be1d971f25bac76/19669707013.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/17848608846.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/15918314814.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/32944040345.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///zitawevinavux.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9d62ef7a---tafozonogilef.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/19258099269.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/80527960559.pdfIn PDF document text
    • https://socardan.com/userfiles/files/wutebewefuj.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/warax.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/rubodapofix.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6158be624bcefa3ad34a00bba6473db0/12744986543.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140705e972f2---7181993535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=baseball+9+mod+apk+1.0+9+downloadPDF 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_off0000bb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB58 11040 bytes
SHA-256: 2906e5f19db4e224428607b805558fbc5fee0d08ef787e6caef26c1f8437d13e
font_01_sfnt_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 16892 bytes
SHA-256: 59d77d9edc1e6ef78143d0a715ce7f27d1167e585e827307c63c1879d6d0e5d0
font_02_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1