Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e402d93bd7b64d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 23:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51230b58cfccd24727235f6a08e49f8c SHA-1: 93fc8584706c5afbdf2982e0e586a1d312e376d0 SHA-256: 39e402d93bd7b64d15d879639ea395e4f30047cad2bb12268c539f3df8f1c462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to websites that appear to be compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5a8c37738c5fd0f30974bdff81ec20ed/rimuresivedadenek.pdf In PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7781bbf5---32578504812.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c665dd9f2ae---jonowamafeliniwilana.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/45fe735552366a1a8f9ea537a0969ae1/36528512784.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/rupafuxusipo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608113bedf995---26001231262.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/61104599466.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824d4287f8c---27156101951.pdfIn PDF document text
    • http://kotolantopeni.cz/file/40627690956.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/tokonetavuzugopog.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/47a497b41fc9bb4129126070617f3f56/libofelelalipaxex.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/89947711353.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0dc6eb211---11710279852.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161124b694ccbe---84386667772.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/29750290203.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1359008954d6f48b3d43136f8e410abd/16435045209.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ccb2fe9b---jelegusi.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/52482995890.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252532d9d1---66771077258.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca3e8a0214---dezekusuwilodufagavanulem.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/79007105003.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/06e599665d02913b373042087a829ad9/52780235645.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/92003784066.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/fadituvaxepa.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/54024618623.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5fc2f3add8527fc85bd1a31cb83815a0/bodufewopukenev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=loose+leaf+template+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_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 10320 bytes
SHA-256: 645decc8db993ed29ab1aa7648e3c1283b8bcdad71686d7cbc02c3479d708701
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 15752 bytes
SHA-256: d99f6fbef3c1cf89650c6ceeeee7dadd2baec59f4e8dfb764695e321ac8a43b7

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