Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c7c65476292bd6…

MALICIOUS

PDF

91.2 KB Created: 2021-09-16 07:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 198fdbbe0100980ff791cd0987b6c8b2 SHA-1: 4ef994bf984694fe737a1a0a8d41c7acc1a64e2d SHA-256: 77c7c65476292bd621981f6090b59baa4fe017f7772459d2819a46fc48a681ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://gym-rectif.fr/ckfinder/userfiles/files/bijasa.pdf In PDF document text
    • http://haohanlegend.com/Uploadfiles/files/28921767246.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/nidunafufabiso.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/rutakawuvanosozatowisosex.pdfIn PDF document text
    • https://dhesient.com/media/80928381103.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/tenifukenelobomomafulim.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/43785291868.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zezufipa.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/eb454b3349c883aaf239ed3725f7b228/51845418959.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614291e8b7037---20350813387.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/46655000351.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/61430735597.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0022d572f---77024654083.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/negexufudiwewegokulowilo.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906005121797.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/03/36239392618.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/93977892147.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b0ed868881497fc14a36afbc7a248e37/77237869643.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/nipibekawofunuvelalaloga.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/55480902896.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417b906ac05---52807700821.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/xajuzipigolotilasonir.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1666813584f3d6e8bed47194fc777ad4/17268281698.pdfIn PDF document text
    • https://ptogel2.com/contents/files/7305959719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fluid+mechanics+made+easy+book+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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 11112 bytes
SHA-256: ae0ff1d742227a691dfcc6c577fb9328a3c9936335d0b0838379584f830c2675
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 22368 bytes
SHA-256: 175f41a4b03f5b344741e9591f5e93efba31b39c2d583503fb5d9acbed156c82

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