Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e72cf0dbd0cf94…

MALICIOUS

PDF

89.4 KB Created: 2021-07-15 11:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 248dddf0b9880953b6b96fcea4c5a8e5 SHA-1: 39a0071b3628db10fbad27d377559a2c7b3ca504 SHA-256: 79e72cf0dbd0cf94ce61e5bf183c9d39929c5373a7364d99b6cab39000672fcc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a credential harvesting lure. It presents a fake MFA or one-time code prompt to trick users into divulging sensitive authentication information. The document also contains numerous links to disposable hosting and compromised CMS upload storage, suggesting it is part of a larger phishing infrastructure designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://charivne.info/images/file/besomekovemivaralojimon.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c32fd67d3---fexuwosorijisif.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/luxovesebiz.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/53748304307.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/zujosulejiv.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec989db3540---lipuwafemawobomulil.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f056f86d---88005767200.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83c01a299---69788046607.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ad49dd21bfcca38114b2afbbc5d12d67/ruxopewava.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/gewisuzigilelup.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/odk3ilqjq4rvb1mhpta9hjegr6/kagubefa.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0s3s5gff3uhq5cbmimokgfhlu6/fulegutarek.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pukenurumenajopa.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/404f7fa28080948b531ec887775a1726/rabobujopipufipafemukok.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/mirilesogarod.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf53b5488f---81443128875.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c29d34186d9efbbeb8c298ad95782968/35634109690.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/dobut.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081071a1f2e2---91079630572.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0c06d9027a4d473c98e9477ce2f46e91/48100169147.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aa38f2268bb79c5b2f30b5a247b46515/10805696540.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/54897788221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=basic+ad%26d+coveragePDF 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_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 17000 bytes
SHA-256: cde7a68a1a228d0810164bcf8049a77e63593c547807dbe584cb2d8922990dca
font_01_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14370 9816 bytes
SHA-256: 5f7b07ae6c8c47c947d7f17581a44c9bff912be2e747106cc379d5278ea07155

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