Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecdf375114e279b…

MALICIOUS

PDF

98.2 KB Created: 2021-07-06 02:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68de06824b92b682a7675b26d7b6ed02 SHA-1: 427a1286f906982a8423c04b808a0f197ad35473 SHA-256: 8ecdf375114e279b87bb744050ae042df3350b468c3aadc6d2c207282955ecd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a likely phishing or malware distribution attempt. The embedded JavaScript stream, while not directly analyzed for specific actions, is a common component in malicious PDFs used to exploit vulnerabilities or download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=font+family+in+css+list PDF link annotation
    • https://rowadalbyt.com/userfiles/files/54711008151.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441188ce3---neneboxalumuxuloz.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/4459851740.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3325scjlq4omab85gvv5ghj1s7/rosesuz.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/33021024296.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e6ee8c966fa0922c69e4b099e76ebf2b/13480957376.pdfIn PDF document text
    • http://freewest.at/46656000411.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/28000297098.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/sepuzixezenizotax.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f6a1771d---moruzufasaluri.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cd776838---xagofa.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/pasejunuf.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620594801.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc752145b9b8de4948e7ec83b6e93df4/sokup.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d420f569---wukidanela.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/97730345568.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0132b611a0---39254618554.pdfIn PDF document text
    • https://rintrans.com/files/95698782279.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607900495be32---mizosijovasugukerilak.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cbe0be27799afbd787f8f586cc928404/nirafabimunemelugifake.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/1202870848.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a487fb0a23f---borazamo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 10356 bytes
SHA-256: 436a4c6724042cdee704b4c67d099743d400b48a63a6eeccf057796b30dc9218
font_01_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 20316 bytes
SHA-256: ae38d6bb6e564ff41da012d8d8085b093a5b412a44bc375e7cb286b93eedc66c
font_02_sfnt_off00014c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16433 16488 bytes
SHA-256: c26743b87dfacdf0858f4b0a7ceb4ab939aa0c8d2a68f1ccae901a3bec0cb177

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