Malicious PDF — malware analysis report

Static analysis result for SHA-256 875abb5bd64da909…

MALICIOUS

PDF

581.3 KB Created: 2021-06-21 08:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d9e61c25e0bb2220b4ec090dcacce573 SHA-1: ede5dca51cccb162acfed97e6f191d1e340107de SHA-256: 875abb5bd64da9091aa036adf36dab0368beee952c0cf9fe0beba7eb964987ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains links to compromised WordPress upload directories. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself is leveraged to point to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9155

Heuristics 5

  • 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.
  • 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://akekaluck.com/ckfinder/userfiles/files/bufezujiji.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae28372aae---63778095648.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075642639938---seliwib.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/f69nb3oo6u100ttoo18n4uo8mi/funexeroj.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ace8465ac---89833134874.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcdca81fd---5149334652.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/56e9cfff1c566d860f1b9d384c9793f8/raditewekutobedajemila.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/85405799443.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/89580870888.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c084da19a28---ninenatatisebiwederasot.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160772d137fc86---tewawoxupujefotib.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b93cc80b---92984758883.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0f1be631---bovomik.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/xesateposozigatagogoza.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/36366427317.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073f35f258ac---kenijumubijotosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=soccer+spirits+seventh+star+anime+episode+1PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00057f0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x57F0F 290736 bytes
SHA-256: 18f4084c90050d4ca3b60468828a95521a1935e03feb7dafe5ddfcbf2626bc30
font_01_sfnt_off0008c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C940 5496 bytes
SHA-256: 707daf36bdbc400c762c04183adfb8118878da1cace66b0e453acc16e8a63234
font_02_sfnt_off0008dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBD2 12672 bytes
SHA-256: 0a417f4e513037b89cfe0cca4946168754f5cd3f769afc0e53b9613bd764545a

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