Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e09baffc8b87045…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 11:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75063467bac788ab6a830528e5da6f78 SHA-1: 9941e324757aa856028e392a40362e6841308776 SHA-256: 4e09baffc8b8704512fc4e0891c5656b5d551cc0aab810a8a702e23bce6d55c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://synerhu.ru/uplcv?utm_term=install+zeraki+learning+app PDF link annotation
    • http://auto-rad.pl/userfiles/file/lobenunitarugemagegola.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/18435901942.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/livovokujuxirubefosizumen.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ac77c5810---wiwulusiruzobewusefuvakis.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/38821435451.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/kusoxugij.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tflfaumpbkub7pl26vpeenn8o6/sewixafibiviwo.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/wadawojitobawemaxomonodo.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nuvivuwun.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/rajomosuriwa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/17722084958.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/14071831179.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613491504a206---34908720311.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/xesopokasejakewifoliwoxi.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/wusuguli.pdfIn PDF document text
    • http://skisun.it/userfiles/files/42263893597.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/3312800387.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/rogesikapemelata.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/xatetaxabesesabeb.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/naluriporof.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/pepudifagenozokejajigoki.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/96210506990.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/22976160025.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/26935631315.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/31375279415.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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 17420 bytes
SHA-256: ecb7fba2cc12761446b5f6ea33d10dc9e6b6d6fc30e11d002fa3f0ed5eacab40
font_02_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 10408 bytes
SHA-256: be13b5a6c0aa1b460399474bf37cb003879c1482a0212e3275d1bf67b422d266

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