Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f954a24d8c1ddbf…

MALICIOUS

PDF

80.3 KB Created: 2021-10-06 17:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 02c5263f01e364af8a7be822542964ff SHA-1: febc35ec1e3fa1c960b3c73c8460dc679cdc7b7e SHA-256: 4f954a24d8c1ddbf460a6b2f10085a31d4320428574befee0196473a714cc2d3
156 Risk Score

Malware Insights

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

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other domains, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://scuderieverdina.it/scuderia/userfiles/file/16493653143.pdf In PDF document text
    • http://taiwan-casters.com/userfiles/file/79327305654.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/96855687677.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/10293301763.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/56650229259.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ac4c67b5e6f0407efe67cb014fe59bf2/53969953989.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/38148058994.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/16792195004.pdfIn PDF document text
    • http://htwy.com/upload/file/wejigeg.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d32453988d7170a966f939b1a1dd5093/zolexafot.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/51833313957.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/37612203679.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sosimujufiwupazelijuzomir.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/27213848310.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/61217562077.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tawezejakopotipulopuxexa.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210909155245.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911215650340.pdfIn PDF document text
    • https://sitarasign.ir/data/file/vobexigoliduw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3851b5e20---63594789486.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/vozepotumiruj.pdfIn PDF document text
    • http://mega.kz/media/upload/files/larik.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/bonekuz.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/83b666a002571f337d73df5a5df2951f/82570317551.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/bunepizofefalutonowupivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+eat+chicken+on+good+fridayPDF 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_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 18932 bytes
SHA-256: e83436d72b334a72b8e7594e1a99372ebba503a167e0f54e2635b3751567ab21
font_01_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 10880 bytes
SHA-256: ae3d66800901253c4061570f148b7a3e8ee6b2b20121f4084ab48c84901a4f37
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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