Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b32ea74db1da8f9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 14:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce0e8b2c784dc6ce5e057da5e914fdaa SHA-1: d8502e57d2ca764f055c795d9da17ea1101153c7 SHA-256: 8b32ea74db1da8f94cb6a2d438871b64b6f0c7bbddeca59b8b66482f0b07c93e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various external sites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ylphs.com/ckfinder/userfiles/files/mewelapubojisizarod.pdf In PDF document text
    • http://orthopediedelft.eu/files/76591413922.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/85889289206.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/xepejefijuwakibaniv.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/kobirudajuto.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/midob.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee62e3b21---jawokup.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jatemavutuvesosumaxan.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/68957325829.pdfIn PDF document text
    • http://aurora-c.jp/files/files/89262575155.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/51913800837.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7157cb0c3e19efcd7e1007461e0e64f6/gupadadusapupas.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/muwirokowoditobu.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/82924997052.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/59241816798.pdfIn PDF document text
    • http://mastervin.ru/files/file/jibimatomadotarolajijune.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/bobemixodulubode.pdfIn PDF document text
    • https://dalba.net/other_files/File/69568988142.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906140235.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/rozidu.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/3784825218.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e4dcec9---batepebagowegi.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/25578882311.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/81127160329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+cast+my+iphone+to+my+firestickPDF 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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 10980 bytes
SHA-256: 26b0600d79282ddac9d5b926bfd4a28216276061542ea04a2d10127467913473
font_02_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 17852 bytes
SHA-256: 56bec8f3a8f80f0803238ae6d0e56418fb99246c0ee092160c04cec9d94838f4

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