Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed58c8e5b4caf665…

MALICIOUS

PDF

93.6 KB Created: 2021-09-04 03:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5265bf80b79fe99a36ac3505590bf39 SHA-1: d4db51eb930bab4400f3147791bff6e12ac17a6b SHA-256: ed58c8e5b4caf665059cdfb3a84c8d15f064a53887759714731c6956e11bb478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various external websites, many of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns. The primary purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=letter+to+the+editor+sample+for+students+pdf PDF link annotation
    • https://eminenceconstruction.ca/viking1/uploads/files/kajurek.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/kufidilaveletenotojubuwat.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1e63d9ac0f0547d788dd0686a801a40a/xekokuxego.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f00a53011dab390cf6b1977f39dee21b/90826045949.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32283f36---soforumivuli.pdfIn PDF document text
    • https://jotelek.hu/files/file/juwunugosolede.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3f87c54bd0c0650c7697ac50d40fc06c/taxexubebexe.pdfIn PDF document text
    • http://yongqingtech.com/d/files/64323330410.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/puvaxedowe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0457e1a27cdd192c0e7bc76b6354691d/52693501948.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/19795011390.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/kinokajadojofuxanovodupi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c386f405cb2b54115c8397756c650f60/37197049782.pdfIn PDF document text
    • http://belv.ru/userfiles/file/42207231864.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0e575f688---64968993233.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/94196868937.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v87bglf69p063v0l2mu0avd7ao/dozifasofijazakoger.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/zixilog.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/78052435410.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/11681926314.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160825ccf326bf---18077181044.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/92167827191.pdfIn PDF document text
    • https://tsolisp.com/files/file/fimuzikizorevoxamas.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_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 17128 bytes
SHA-256: 4c8b935483f108245d008fcba2c67e3332d4d4b7dca4a7f85565b007ad862b45
font_01_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1E 10820 bytes
SHA-256: 309e8d37f7801386a261f821fa97e83a14c5239adb6763abea2fa786a78f0a9e

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