Malicious PDF — malware analysis report

Static analysis result for SHA-256 e326b21f51107a5f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 23:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6022e76ed33844df1891da91c518d351 SHA-1: f171a659935719e5c3d30ca574910a12c4e77604 SHA-256: e326b21f51107a5fb8ec77926d0b2e7ff5548f9cf6f14b9ee8c03cd9fd90b826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious or phishing sites, aligning with the characteristics of a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=acc+aha+guidelines+dyslipidemia+2013+pdf PDF link annotation
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8cf08a5cf---45314508144.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125836ff3e---16787736462.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/53286650213.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/xujino.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunavusobekudotoxetineru.pdfIn PDF document text
    • http://furniture83.com/upload/files/18605691176.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d4ab1d583ccf87294f3b2591558b1c16/wutamunizisazitodu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa34bcd08---25110215578.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7b00d4677eced301496cd2e97d85a801/22477162995.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/64709342642.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/pitun.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/36170582492.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160876643aa082---12267965741.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e2024f9f2---tasulexogus.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/vofivovifupimegiga.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/49086490562.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/migifubabibejifirewekadib.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/97e2cc063bf6f4eaeb4d214fd0ee54d0/somegezoxugarokoguda.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/70957838037.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc20d1feb8---51901777103.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/molasevopa.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3822def64---kitomofijapesama.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6100eea0688b2fe9f8dce1ffa3e9495b/95930745276.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddbff97cd0---sidomuvesox.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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 11412 bytes
SHA-256: ec01effd96178b52df3c3da284a28e428a8872bf90794b69bc4ad84027130fc9
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16928 bytes
SHA-256: f84ed514fcd54303913771e5034402acecb95663f8f8c2af5df20b7bc3346d6e
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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