Malicious PDF — malware analysis report

Static analysis result for SHA-256 535d2a0c02dbac38…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 08:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5babfa588173b08d4bd8cd19793abe4c SHA-1: 428302c0634fb1e1f5db2be2c09db7c1267cda4b SHA-256: 535d2a0c02dbac38c4a3657833a56ed23bb984d6d908930deb81e580c54f089b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and the compromised CMS upload link farm further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://penal-garazh.ru/files/77894769329.pdf In PDF document text
    • http://cafesezony.ru/fck_editor_files/files/lidowagumixoxomum.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/lemexupuli.pdfIn PDF document text
    • http://446888.top/userfiles/file/ziponogipatatizapebeb.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/63558438163.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/ruwivibalel.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kekijosogikigejatorupewa.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/23319067669.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee97a87d6---59145188390.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/71504865919.pdfIn PDF document text
    • http://synhbio.com/upload/files/52009891127.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229268e75f---42194559374.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/nuruzabunegadama.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fuxefizev.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422d0afb6d---61992201764.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141622788401---68051608687.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/21480576702.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/95048390084.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/72500813098.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/jimivavonotoriza.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/54928097153.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/3209650152.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/17698594746.pdfIn PDF document text
    • http://tcihk.com/userfiles/gexironew.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/4777611967.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/75750605364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=index+of+tv+series+gothamPDF 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_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 15968 bytes
SHA-256: 216ebce8c9bb17e59730a2f3d6d734793aadae79bbe9a555915e2149fa31c4cd
font_01_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 10876 bytes
SHA-256: 52336ce34bbd6ed57c4f7fc6fcee6c94092f9e3250be776baa89aae0715ffcc0
font_02_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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