Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fdb2e8ba9d8e31…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 20:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7b37a6524d879a5f7ae51f9f6df3215 SHA-1: 257dd8cd10188e273ba4758edb5eb0ec1a6a4681 SHA-256: 38fdb2e8ba9d8e314a0dddf2dbc3889071eebb5c2cd51b86fbcf354449abad1e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=pepsi+man+apk PDF link annotation
    • http://taaltoetsvo.nl/userfiles/file/20863812944.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62101883974.pdfIn PDF document text
    • http://greenld.com/userfiles/muzasaxe.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/kidefexekit.pdfIn PDF document text
    • http://sujoydhar.com/userfiles/files/vivijef.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/losadogini.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/15892759324.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210928_F348753E89BF5FEA.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/megirojipoxozinijene.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/65800347141.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/fuwasajoletojadozifuzunu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bacee88e---1103231917.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/78f2172e90cac2fa673d9af864cbab0a/nifarajo.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/xodija.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/79715607380.pdfIn PDF document text
    • http://web5gstore.com/Files/files/ketinideduvazijomofa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130315504433---nadabas.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/35690639891.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/tatetafawoximulivon.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/36191920635.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/xakotafifugovi.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/59622843761.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/39085988343.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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 10140 bytes
SHA-256: 0a7cd839a0b1cec20b51201daa0b3907c7251619efb29a400e4c4aa59ff535d0
font_01_sfnt_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 16824 bytes
SHA-256: 8c72edd7dfdf9bf3044f21091526ebcc1c3d7b974b75a8df77cfc5541301dca7
font_02_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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