Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c8787b4120b2bf…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 16:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4f27f58cc3cc7ac9884fd36d4e6acbd SHA-1: 126c38da63c35a527cade82278594c0656fe5a51 SHA-256: f5c8787b4120b2bfb01925de3d67a3423877b2a863fa4eab67b84c37fead1e69
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to disposable hosting sites, a common tactic for distributing malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, likely for a scam. While no scripts were explicitly extracted, the ML classifier strongly suggests malicious intent, and the presence of numerous unknown URLs points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://benetworkingpro.com/ckfinder/userfiles/files/75897437787.pdf In PDF document text
    • http://lyzebrno.cz/userfiles/file/36183171132.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/depojedaxuderejotubog.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/luveluv.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kerilewelenorilifin.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/89068186141.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/74596959430.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161301b8887624---41250442671.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/midoso.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/76134591273.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/76413922720.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fqcvs8b8kgm789r1bkn8c26kpp/531120296.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/493919105.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/memozabifaponodokopazaz.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/64389363147.pdfIn PDF document text
    • http://chinalabware.net/d/files/54524553699.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/vejobilo.pdfIn PDF document text
    • http://ecole.ru/text/images/file/tulumizeguv.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/22922043397.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/fivadefub.pdfIn PDF document text
    • https://pokereshop.cz/data/file/51500995204.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/51175fa68ec1254b3294d786c8f358d1/84670446495.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/50199276819.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331e166b6dd---jatujebasilifudux.pdfIn PDF document text
    • http://canadanur.com/resimler/files/57949852766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sat+math+1+practice+test+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_off0000bb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 10744 bytes
SHA-256: 3960410b8740bd240f1914f41250cf2b86cf83130cefc0262699b21009a5d85a
font_01_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 15996 bytes
SHA-256: 1e608da869f6912ef54430af9897487a6e16449cadf4d4c2f985b3b7fa5202f0
font_02_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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