Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78e3d5843a97f04…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 04:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb8d58448ed6a8597732e834f189d0c0 SHA-1: d1aa9ed11fb4e0b120a015ff397fdd42908006f9 SHA-256: a78e3d5843a97f049674dd3df6db86b42db9533078d71d235629b7d5fabae896
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous external links, some pointing to compromised CMS upload directories and disposable hosting, suggests a phishing or malware distribution attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=cook+up+a+storm+full+movie+download PDF link annotation
    • https://kaparatt.com/images/File/gapar.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/14746671138.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/09c749e165d4682a9a32a4818f06827a/sujavepema.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/15517458092.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210907_86F9A9AD9D4301BC.pdfIn PDF document text
    • https://securitydm.net/slicice/file/nagetavaxa.pdfIn PDF document text
    • http://haai.org/upload/file/dafizudotanadi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fipatepumuvorole.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161485faa76d83---18588302650.pdfIn PDF document text
    • https://songhongresort.com/img/files/27426682216.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/91805922476.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/vakemimaleliwegidofujodi.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/bowifafidadegomijad.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/62756956233.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/67709062944.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/44229328695.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/aoi8vm679vpp77viedh59mmch5/39262749240.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/zetigufetamori.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/11714427163.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wazun.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/94414215221.pdfIn PDF document text
    • http://aweibel.com/Photo/file/28346421236.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/tolasebinabeton.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/makuxodalinedupuvubetu.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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 11036 bytes
SHA-256: b72db937a78adcb8f7b7cd216260cc45c1c451867f35bad9e9fde9efde6baa3d
font_02_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 17140 bytes
SHA-256: 4aa762fb821c688798ceb0ada5196bf8ffc4790a45422a43727669096881fa22

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