Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f8d43859cb58e8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-07 10:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1713d8f5f285c536d08fdf673818e892 SHA-1: 92dee6367f32b3cb88690311f2d099a35a9be08f SHA-256: 62f8d43859cb58e800b9ed1e1e5a3644174bbab5991e0f9c4ad1e4617947ba04
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://chpcentre.com/files/file/zabibesevuv.pdf In PDF document text
    • http://vimar.ua/userfiles/files/33250055635.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lusune.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625643010.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9faedd8688---baragufapavujusudita.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/41098aa76076f9c63c54a59587d73a28/13603885322.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/5245616d6a57f07d84f821c1fc6bf2c6/makakifuxo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/41515434848.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/tekawutirekafiv.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210720010137346366137.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/dadap.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/75791273467.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/d16045b2a71ec5e94ad4c1cc97e44cdc/xaveporidupumipupajiwuraf.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/9p7hgqppqrmf74sfklssl3re6s/28122491292.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/pikodipuferiwuxusatinad.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6a5ff7dba4739941a67850158d59f52d/givupebexafi.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/zodut.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daac056ea6---90344570595.pdfIn PDF document text
    • https://termoformat.md/img/files/63953577928.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/8692080036.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/33225502580.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5dd8dfa14---72974995786.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b2466662740---54087326414.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/gifibogitisagex.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/femamijofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=paso+robles+wine+country+map+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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 11220 bytes
SHA-256: def80b1fdb8fe1642626f6a32287d393901267357449467e52ce114e52b8b668
font_01_sfnt_off0000cc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 15608 bytes
SHA-256: dd7f24bf60fecd604da5f5173ab1742f7f5f27aecb3ee554e002deb8e7963fee
font_02_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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