Malicious PDF — malware analysis report

Static analysis result for SHA-256 c762363b8176ff30…

MALICIOUS

PDF

80.1 KB Created: 2021-08-18 13:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0bec11bc3bf85508e737a8811b06d4e SHA-1: a93fd79bc296230f0aa0b018a0871dd10eaa94e3 SHA-256: c762363b8176ff307787947299f2f1c372de69028a2ff815009f7b2501bb6067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/85611f375c4f3ad5605cad7a9b5066bc/daxepumus.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47ee7f203---37503384377.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/987cfd7e3671117d3c1cb694b1058eab/78005232607.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c933c9640a8---52937003948.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/33924632498.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f845dbe307---85357518921.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/fajesudebu.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/60706816850.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodul.pdfIn PDF document text
    • https://lazerom.pro/media/file/xikelujejepudilarasiwala.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a49f47ed40f---78887014055.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xisaguw.pdfIn PDF document text
    • http://robbes.nl/media/files/89947103507.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/81418892927.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/86936637160.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e342014ff6d30fdb9fd71513842e2743/2808233433.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/8420258792.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/wisefudeze.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/fijetejosubopujulokag.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/diroguluxew.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/358d20b6c143c387aa50f75f0092dbf7/zelinejeb.pdfIn PDF document text
    • http://katachizu.com/img/news/files/48013347241.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/risanovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8bd8c9d1---74545851099.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/cgsf2nbognq6oq2o5pvduro95r/gibenelitufaxi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c36594330f---58163766624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tintin+in+congo.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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 10216 bytes
SHA-256: 3243586030c7d37cfb9f4b096c009a38864f7974c455b8d5d22b471c4cc68887
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 15364 bytes
SHA-256: 0fd86ef04ac3d97d953ab3ebbb1123d3735852deb9a4812b64d38be45730d6ff

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