Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd4c2dbe8cd71a2…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 18:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6f5c1f3d36a5658da549841accc19e5 SHA-1: 25847a42359320e7ce42f05215ded08c77dd6970 SHA-256: edd4c2dbe8cd71a23f3a802318ff7b3bb13725897c17c16b14005a84d07082fa
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 heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=free+fire+gun+skin+hack+mod+apk PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161415fda40b0d---77389411434.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/59921568862.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/31001404674.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/fiwobaduwokufujowirola.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/pogower.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/0nd1l2dn8r1eg7nia8bd3ncuol/37552055932.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/81019370406.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zabajironoxejin.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/50212037034.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316e26cc3a---vupipoxof.pdfIn PDF document text
    • http://sro52.ru/uploads/files/61607818108.pdfIn PDF document text
    • http://irinabailey.com/upload/files/86359837481.pdfIn PDF document text
    • http://ssp.by/var/upload/33562562590.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/61824845710.pdfIn PDF document text
    • http://xsteelstock.com/d/files/kaxajubezifofiviziladule.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/2552390517.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/59997010153.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/54679598042.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/826ab5c7aeb758dd4bb6f570f8dca36a/40918696830.pdfIn PDF document text
    • http://scro.ru/pic/file/gebiwuje.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/totarepoguli.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/23b99a383a92c247177183f8b41bcd37/wunilavogegopulawa.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/jesitolusevugogijemojuno.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/sinuwozomopiwewadipex.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/48340163464.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_off0000b0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 15784 bytes
SHA-256: 0c18b4c84a8b4a187e8335a4f9ee89a30095125b449bc7301a66676413c13bd8
font_02_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 11092 bytes
SHA-256: 7e5ac57207589fca0c3a9b2a0f3c3471f9c8a690a8a9e6168e40f085e08d5049

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