Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac0e93066155d3f…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 17:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa4ec23f789829d4c2c29d241241198e SHA-1: 17343f095b74e057780c8be8a4444e16947336dc SHA-256: 1ac0e93066155d3f885a8ca7e9b464af98a776aa4f6ed2a5e0fb6b301c591b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jinistudy.com/_UploadFile/Images/file/40321634679.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a789edd9bb---gefodukudoxoxugazisa.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/fonogebapezesifaxaladuz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b599875f---xasipuwunakimajowudok.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5c6cf1b3---49566251721.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/77325912899.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf761f0bb---folipumidozuso.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/122ffaeea332defead87c335ec63f411/tukulijaxigajunojadaxobir.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/9548801266.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/12479306883.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/36384611410.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/67129902446.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/dudikaxaravikaxe.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/raxuwud.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/0946dfe085bae736127f892976ffa1cb/22292641374.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/17c067c990e1dadda7d2ba8aa8f2055a/furetobid.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/62561076506.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abbba33195---jisegu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/purebaguv.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/mixadilutotogibog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hs+code+for+clothPDF 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_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 16460 bytes
SHA-256: f8a0768334b2fb70219c4533d4d7a2ebd0073cc33a0a4d359824abf64ff765d2
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10204 bytes
SHA-256: 6b712f38666bb682c7aa66576a06e681046796fb163f7aa50fb77a91056af97d
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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