Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f4fb3f69f4284…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 23:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8710e4821882ff65cb97dac559a0c0b0 SHA-1: 486d85933b1cda659c95c46aedf9759dcb0a7510 SHA-256: da3f4fb3f69f428498e096af52c109e217bfe943d9a27629e055d796d12d45ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, and the structure suggests it's intended as a malicious attachment delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://portaldo.eu/contenuti/upload/file/dokedawobe.pdf In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/61942be6eaf3c6578062e548b6a98bac/93881558720.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e43a48df8c46e542e5d44cb65e45f92/zukelamuliwebozuvil.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/jisolomuxulobo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/65ea92a45c49c0aca0adb6545984488a/4104605198.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8bee4fbc9ff9244b34cc5b85d39e7068/fodujolelob.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/ravifawewatovagidunoboze.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zezamabu.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/j4a4ino02sod9bf7v47ibgf5q2/tubugonuda.pdfIn PDF document text
    • http://cy2hand.com/userfiles/37614352572.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/guvovanuvozefavaxirogof.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/wajaf.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d6f573ffdf30a62a6170ec421923d145/91054983180.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/86uhke0gp98spm4s1h8s1dhf5t/32789190654.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/89b4db6275c10b82209fe8882149bd45/figunikajozapu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/bedonakiginisixit.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/kokeliwilanevizadez.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160750b349c346---xodupi.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mamoxumazimawad.pdfIn PDF document text
    • https://ijpdua.com/contents//files/6058257625.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/luwelupupuzilogod.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb38099e7a---gevekokazupawubajujub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=grilled+king+crabPDF link annotation
    • 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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 10432 bytes
SHA-256: 949c4dff5f0b54613f2e1cc5683576629633fe98a7523c693daedf068794c6f1
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 17572 bytes
SHA-256: 17f04185fcec5bcb84904442d628376adf45e0b3b0957704162255d340d568ed

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