Malicious PDF — malware analysis report

Static analysis result for SHA-256 2539cb1f5eb7c3f7…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d8f31aa4a99155dbb1e271b8baedb39 SHA-1: e4678d69ca7f2f1e94af29725a017d662004a019 SHA-256: 2539cb1f5eb7c3f75e94bd6882af56f4d5ce3789dbd8f3a15557055b69330028
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=hpt+muhammadiyah+pdf PDF link annotation
    • https://numen-wow.com/userfiles/cloud//files/13750428233.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081021be0eba---dusokil.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a606917cdd7---vepuberewufijajomixel.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/nujuguketobumojiti.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/boribu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e121e4ab719---nevimitur.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e4d5b5b4---44888249851.pdfIn PDF document text
    • http://artside.org/data/temp/file/21458883615.pdfIn PDF document text
    • https://atl-50.com/files/file/20627988892.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/mufebuwew.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fixajeridawawufusab.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705e53074b3---notonagutunob.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/17038103241.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/70354793452.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gunivowabegifotuj.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/7144580501.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d96d5573---wunofozenowomawedefeket.pdfIn PDF document text
    • https://hgb.se/filer/file/92387129192.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2a9877ad---naxalidiguvutogon.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/suritepobupanugegazikimo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/cgia376mnncvq372i4t5coa42q/lewawosapunusobajaf.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/74840402211.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/23061557974.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/99110414575.pdfIn PDF document text
    • 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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 22044 bytes
SHA-256: e7cf682237bd831e4cd9af8ca444791a07686348ce78d25b539dfd4054a29366
font_01_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10296 bytes
SHA-256: a4115caa4999c01bffd50ae6c42af43d20e14fc99ca70a9d3a04dda708d63bc4
font_02_sfnt_off00013d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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