Malicious PDF — malware analysis report

Static analysis result for SHA-256 55795b44e3b6eb9a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-04 14:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 066a219fc0da827bf3aebed62464211f SHA-1: c8e51488313e71c860b28d184baca97daa6bc396 SHA-256: 55795b44e3b6eb9a6cb0d64a5b34e42803106411c083bf60c57db3f303fba9d8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=unchained+melody+guitar+tabs+pdf PDF link annotation
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fc217490fa67cf5fed8a7e2244f47204/12096350189.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/gawame.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610951c3b256b---91114109507.pdfIn PDF document text
    • https://susta.vn/userfiles/file/karilupexov.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/ziresumibolenuwi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160782da288dd0---vigedoferebugilivaromuji.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22ceb560b---65337370772.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/83254351182.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/94452848482.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607885d709bc3---bumopibuvuniv.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/13b5dbff1185906b87d1e6d24b17b062/fazemipudofanurox.pdfIn PDF document text
    • http://inercial.es/uploads/files/17863706318.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/posajufabulovusokopav.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609895c4c151b---guxukavili.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/73mam4clq61il8repi4mth9ico/mutomosasusoluf.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9496199661176c0bae712.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc73944b0---potumofesoweja.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/36095800028.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/31315570255.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupesewuwuzikeke.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/lukawonuzazaxixofumizesuj.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/5660328679.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c55097b652e---45007489921.pdfIn PDF document text
    • https://resicolor.com/upload/files/panijovujuxusukisub.pdfIn PDF document text
    • http://candientuvibra.com/images/file/rarabafanovevonedikunexo.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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 14800 bytes
SHA-256: 882870de17a6fd36bc875dd517bb0a81c70e37f1fc7a09eede66813745df2673
font_01_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 11428 bytes
SHA-256: b0d24c18d626f743f6f13b0a14f9864763b6b690cdf42b3bd6daf6b0acae6c8e
font_02_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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