Malicious PDF — malware analysis report

Static analysis result for SHA-256 79de385a6b43eb28…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 07:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c5daf40dd52561db124ebf2a92b415e SHA-1: d80f99468f4c9acd48acdb9dd5b116b1329cbef5 SHA-256: 79de385a6b43eb286aa3f021f8177d768979b9ac146a3a32cf07b2c45f062be2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL patterns strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/uplcv?utm_term=reading+fluency+and+comprehension+passages PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbcf86d80---58100134499.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/luweriwunowukikininaru.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/34a1814e15266a23851a25321701f3df/siwofesotudaxaveguxora.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/lotilomug.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/20655603471.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/76368303738.pdfIn PDF document text
    • http://texmet.pl/userimages/file/besawisik.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a9bb5a59---bujofexelajotofuxamit.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a40455d9ecc---59296845275.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46ee2be7ad---93172924233.pdfIn PDF document text
    • https://mollis.rs//files/gokam.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/67267f99b8005e185f58adab0799880b/61016722605.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/6032762062.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f906642877b022bd131668489984a945/kakobegaxarenebavexo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160874ef449966---gexelosiz.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/muzanikaforerenes.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfda4d946---lajofazisugapijosunuvutof.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96784632c8---kukezawotipuruzivunazezi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/bafetumepivomixez.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8a9b41aa---zavesunamojanepajik.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/96cdb9bd7c70c8c6dbb025cfcf33afc6/79393222737.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/49phh7qo2mha4lcjpq0f29grj3/zaruwujudusuxafamalamirim.pdfIn PDF document text
    • 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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11228 bytes
SHA-256: 6fc4a6b068739c8da75408b6fd942e6fef97237408cd66a47658ac16ece9b6e3
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 18024 bytes
SHA-256: 9bdbeded67a8f6b4eb8997126c1a862b0a7893d11bdbfa86f9ac72c6bc11d37f
font_02_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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