Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d9daecba9c7c22…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 17:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c61d5b577642d0f015318addf9490721 SHA-1: 0173d32c81474448d61d641cb63e613c14842041 SHA-256: 74d9daecba9c7c227a4240c8efa153c5496b743b18ad1e9b98524807d2c35068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o28hf24hc96sildu4kbs3otr3f/nojirikapej.pdf In PDF document text
    • https://legouic-peinture.fr/userfiles/file/74875281780.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/29443370321.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/bokopisebotojof.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/wokudofamev.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f29bd74f0---22707155086.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/12504245370.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/wifudedij.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/84163608497.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/befaferosomifes.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/72845589796.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a45c2f8a---97042828670.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/vejujeradurukigedaxedurap.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/6245649754.pdfIn PDF document text
    • http://boxethai38.com/upload/file/xemut.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fomopasafaweguvufafig.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5fd37634f---kulikelakederazaroxa.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/fisupi.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80396856049.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/2023269501.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40381309389.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/fedokibezovarekipodexomix.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090212024412.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/zelega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=scientific+theory+vs+law+worksheet+middle+school+pdfPDF 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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 11320 bytes
SHA-256: e7f8973ed5ea1f38d9e545b1f622e4e974e9613c62f9181a11a83404cb057474
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 17424 bytes
SHA-256: ef81504984cd0b863f20b2231dd818255b89f3650d064ba791deef4d345f2277

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