Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd358b1081a8419…

MALICIOUS

PDF

93.3 KB Created: 2021-09-01 23:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97c83ec49075cf76218e6026c13ae777 SHA-1: 29c8fb7d6c2f618143782fc52425f6cee9d2cd35 SHA-256: 4dd358b1081a8419a326df6c01231dbb283f0d3775c8214462207236d713c8f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://oniceh.ru/uplcv?utm_term=peep+show+party PDF link annotation
    • https://rintrans.com/files/megefuse.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c86f3f25c---xujutukazedogubela.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/27557215183.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c0c5e51b27da332ae3e1dfa031c3a8bf/75867793161.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210829030518.pdfIn PDF document text
    • https://stopserv.ru/files/file/mepibiwoxaganedir.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/11761496911.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/k29pm7kqjuk7kh1hldof8s3j50/5752693513.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/lotozaferi.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/rikipoxu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/97758944866.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/kudiniwu.pdfIn PDF document text
    • http://talleresjpg.es/img/file/9605474839.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8f93031ef91c6aa81ea23f7803b09a54/lufabogowuv.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zuvibapup.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cb7b2ba4---82339541055.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/reparezisonifujowowujaz.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/sajuxevagolobafuba.pdfIn PDF document text
    • http://186086.com/upload/files/tulinofipiwawad.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/15348177165.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/21215011144.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/lunuzoxinofujufigibuzi.pdfIn PDF document text
    • https://retta-bg.com/userfiles/fobotefibirozifixudopetez.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.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_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 17688 bytes
SHA-256: 9b1fb4283e7dff41dd40ab11ae654dd194df9ef0c4331a688506bbf9b6b5c64d
font_01_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 10308 bytes
SHA-256: 241678c637fc3ae15521c1f245dc8a84ba25aa0743cb3829448401cc8f7fd188
font_02_sfnt_off00014f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1