Malicious PDF — malware analysis report

Static analysis result for SHA-256 77aca89e7ceae57f…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 07:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b2310004c1f870c21b046e03979157a SHA-1: ee6ffd5f990aed021deec6cc73ada431ef3e4843 SHA-256: 77aca89e7ceae57f75ca13494b321b34f987fa2d3d9e01e20c8269db961cb40f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jlm-kg.com/uploads/file/76998541674.pdf In PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/92897141445.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/suzekikaboni.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d09d99119---91038143309.pdfIn PDF document text
    • http://dhf-china.com/d/files/37511764830.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/suvumijijakaj.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160906c1844dab---21455139326.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e538279fe---80902220854.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf98c65d5b---95676447173.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/431f4fb7f9d86a60d081313ca065d176/17268237432.pdfIn PDF document text
    • https://digireg.org/upload/91135766526.pdfIn PDF document text
    • https://noventa.cz/media/files/file/zexasalipexefopisi.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/34413995312.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b087c96b---56847684938.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05ff27adb---88560169288.pdfIn PDF document text
    • http://ciskmv.com/css/file/nujojotomiwawus.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/22608864082.pdfIn PDF document text
    • http://evola.it/userfiles/files/3841930021.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/49271080944.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/wobibobivuwedib.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/fdr6e9fisusolk4fnropfdl87b/kafitenerifev.pdfIn PDF document text
    • http://irollee.com/userfiles/file/vujenimususitazom.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcef8e192f---85378181287.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/gamikixujobinegetakibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=panasonic+genius+inverter+microwave+oven+manualPDF 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_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 18208 bytes
SHA-256: 9ad1c608416eddac2f26c6f76217fda14d19495e183f53c9a570794200858040
font_02_sfnt_off00013d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 10828 bytes
SHA-256: af2d03375a947823092d0ce3812364fb330ec6feae0cae2da78d760c617076ad

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