Malicious PDF — malware analysis report

Static analysis result for SHA-256 76370ce436dd27df…

MALICIOUS

PDF

82.7 KB Created: 2021-06-25 12:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2be7357c8c2967c7f0d215bf3a5b9df5 SHA-1: b748b4888ff47c605d0c1b032d94513ca5233c0a SHA-256: 76370ce436dd27df91213dd389a5be9eae8c2f26ad97f00d112d271a373e34c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an effort to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/higmthlo1merseisggunl2bgls/lupewegegifeke.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kanul.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2f8afef1ddf64d997bd6ebe5bcecde50/84716646846.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/581610aff3725d685af0847743de7346/dojorikajovir.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fd509531---nurejetiwevuxujusoso.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750fc1db1f7---pimarexotozosowuju.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c10a8d1c185acaea9ad95fef1ff885b/bifazuwujibina.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6e77af8d97eb0762ab5e48c79b7c6a64/gufuk.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/76039342958.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/dabon.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7480a7de4---gitomorinimimi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2ft4g8t5cn5oioj79mcc04lp30/75638387120.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7507b6df75---30495126.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/77988197726.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074909eac432---sotakudapulafuxabeb.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/eussghi692ekph2hbto9ibglk5/25461438533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+download+free+pc+2020PDF 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_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 10768 bytes
SHA-256: eedd9ff8c11cca6731cc851d4a2c2045d35d96de5125bb70943e127d3c4e9ca8
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 16812 bytes
SHA-256: 9175776e29ad247da5021913aa75830cd2eb9995f7c1b1c9cd8b847bd39ebd3c
font_02_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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