Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c5efe9bd0f7d3b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 06:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30a7cf29deb2f9ba5cb9a390a92c5ee7 SHA-1: 9fc024ecde476086a96c3bd2556c47230e30fd25 SHA-256: 45c5efe9bd0f7d3be7525d7f463056f603676555165e325f25cf32c561e56bbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://lsmtrontractor.com/upfiles/file/20210910025844.pdf In PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/dusajopakunedojadod.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/22112947377.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/mulosotikekafol.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/9563381034.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/18206856998.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/43335796560.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/nivebexazetupuvulizufolo.pdfIn PDF document text
    • https://izr.fr/files/nelofakiw.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b4b6b760---31499215415.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/voxojawuxowalowafur.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/basakamurotavumu.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mexan.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375936429b3---tulowak.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/87740606411.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109021135153248.pdfIn PDF document text
    • http://mousike.it/img_ins/files/20717974705.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a9f33b39d08c6a9104820ce62cb7b3d3/matugumo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3trmo9abu30m8bi64hgjbc9c5v/mikal.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612f8642b95ca.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/fepekasepipin.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_B7386FA2CD7F972A.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/dagun.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/zulexuza.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/39538039616.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/kodesiguxepikodabusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=airport+city+android+apkPDF 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_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 10348 bytes
SHA-256: f52436b283961fa09592b48ce669574098bfbb32594a3d916b8ea419909658a7
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 15864 bytes
SHA-256: 4e60c80b83908ce9e9f33209e78bc5c2af9ebf4b92996418567f1db5c13a18d7
font_02_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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