Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bc6609515fe9c4…

MALICIOUS

PDF

144.6 KB Created: 2021-09-07 13:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95dafed389ee0d0303e23019620580f4 SHA-1: e7f9c65426c865136ff883d9dff10f9457edc848 SHA-256: 85bc6609515fe9c4f0f181f9cd6e8bd1e85dc21bc3169206277583cc1ad9f488
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://bahia-group.com/ckfinder/userfiles/files/pekomoboximed.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1be3fc5de21c5d41f764fb31a79a05aa/13249307706.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/31352164154.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/nofojenane.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/vokusaxexewup.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/zaduwudukowuwamena.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef1df3c14---vewotojenogugix.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8608df0396af19e7eeb7770177503d5a/wareridu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/58974580831.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/50812043323.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/8965480593.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/49197078357.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/22806388938.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/21182408934.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3daeacaf---sobisoxa.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39db216ab---zazoximelo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/bavifasilofin.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a872447d6---58422684710.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/6v7bj88th8qvcr5cr3s5i3uu05/57392928259.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612d925144340---fixivifolosiv.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vjrbbe9m388qglnrdkc353lgkc/litoger.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a604fe53ce926e4f8ce17c540ab5bc1e/mawob.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/wopekebodesunikadelufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=america+settentrionale+riassunto+pdfPDF 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_off0001cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC8C 10864 bytes
SHA-256: 92db8661c51f7769dd254cecf721bfaacdad6d0f19b5d403e01078993f376660
font_01_sfnt_off0001e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E598 20476 bytes
SHA-256: 7b8ef1eebf9a397cd003c8e44c396f9ec6e6bcb8578e9cd89c97f4eb34444e35
font_02_sfnt_off00021c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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