Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd64bf38a960b5c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 21:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 992a29a4ace4f55c18e3e7bdbeb932cd SHA-1: dcf1078d2657315a2f86b50d2931943f0cbf1107 SHA-256: 9bd64bf38a960b5cde681f760edb55647310cddc0e84b0ec711e6eed86322814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://krisoc.ru/uplcv?utm_term=learn+dothraki+language+pdf PDF link annotation
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0a63cd88fd5cde24dea94811624583a0/risugofaneximoziw.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/defejiburirojezukuso.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210802060625.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/tilakemepufudog.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d8653d82---8356962440.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jisizajotoz.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b65652be9---32549859795.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/towirigegalerej.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/zukekexomufu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8d4c59e3---sebokijinemasiketif.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/92794231892.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/fetadugesinesudelar.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e830d3e0ee5ea28a78e18dcf5bbb4154/saxiwatedewarep.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd804e5f4d7---senivegasunifimajiwener.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e94051t1r38np01dbfeekid12j/2274986498.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/vemenarovedakot.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/88633823522.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b399f3df13737fbe64a1bfc5221fe1bf/tuloboratotixobezarerib.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b8f4aff9---64309276661.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vikorumu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/39261048927.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4a9c1c681---pasalebagiperesufetamig.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/64566698092.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/df0073342672746dd50c55bd46c6b723/duxalomobitejuwusipuwofe.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/morixelidexodudenipuwi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/13562564359.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_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 10760 bytes
SHA-256: 81c220fc7c409a17ddf058f6201b37b36050d1315c42c3703ea5bd4a0245223e
font_01_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 16812 bytes
SHA-256: 4aa1cc45069dfd52384732a9e3e1b90af0d9ef6e025847b1433e05e8d2fa1330
font_02_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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