Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1dee278ed884f8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 20:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4bb2940bad37f3755f39593b5e9d12f SHA-1: 10699501403640e44cf68f325ef4ef6ecdace166 SHA-256: 3e1dee278ed884f8754b10f7b5c3fe32cc55b1dcdd66a1ca22bd82a79b77194b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to what appear to be compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of multiple links and the overall heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://laborke.ru/uplcv?utm_term=%C3%BCbungsaufgaben+mathe+klasse+4+pdf PDF link annotation
    • http://myjobcareer.net/userfiles/file/2021071405095573499.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/51774391261.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/tejonur.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56625254112.pdfIn PDF document text
    • http://medicentrumbs.sk/spravca/ckfinder/userfiles/files/nowokibesenoko.pdfIn PDF document text
    • https://sanidom.pl/img/file/17801237056.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/kajifexedus.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0f786deaa---vikumu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9b259bc99c73b3a41cc1c833f1b45bdb/lopixisupevowivoxis.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f24051a2caf7e475874fe6e3dc28c0ed/59942316540.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/28628107120.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rimafu.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/27501212920.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea50e2c8f---gutavukemukosedolazup.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/rizapu.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/rowoxawu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/da1691a3079b2664020063c600c7d036/tofapisuxojubemorasiwufax.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f6085a4a9b82c2a1baa190109a8450ab/36533725730.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/13966887046.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029c664434---xovumajetebobumuxogumixup.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/zefiz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/q98q7nfg130qkeafrled4oj3mc/rebuvidalez.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d03272c68---sigagedevexebumisudi.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/sovekisolitadeso.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dbf10305---guruzumidomon.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_off0000c0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 11144 bytes
SHA-256: 45c0d36fffd48aeddeea5980189cdfb4db9564c70e71381ba96a04dc5dea8227
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 18288 bytes
SHA-256: 994d06d9a46a2bbc010a0d2a2be59c5bea9d9ef74d3f6c1aedbe3dd11af2cf4c

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