Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b677ced91d33f62…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 02:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: be34cd363948fd7a0dba94fb3d18d8fa SHA-1: ecf493323c9d4967e9896172756018ecbc87b915 SHA-256: 7b677ced91d33f62a3ea25d8bb6168842b1d2bbbb5d4cf494c412bb658d1375d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely serving as a lure for users seeking free software. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggesting a tactic to distribute malicious content. While no scripts were directly extracted, the presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=minecraft+free+download+on+cellphone PDF link annotation
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tfe10glm70o5k8n1ic7jkgr981/2250114186.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/342239ab211d014e43276a8d936879e8/fijipakodalijak.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e0pnqdbe2e7mht9crcr6b8k7f0/vifojigo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d688bc5b762---wuzodipasafaxasiga.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/kep1vgtmdl7b2odrgdgpigrrtg/safededobud.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/23214263559.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/tuxafi.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecedd33ee---67461123457.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/74515818520.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68ad03beae---bopujadorinigonolupel.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256549544a---jupoledarelugagenativejig.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9tmji2nd1ak9if5ncqrr564uv6/92521478027.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/1373918728.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/tavepabupugaxojasafaperor.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/pljmqm62q54nr2de25o98pdbq1/xolotaloladasoxeg.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/tvs81a8han05qm0eaisiglt997/rogeparo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8b162298---24666376813.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/77al26mlq8mj9s9jelci9vt35j/togir.pdfIn PDF document text
    • https://nevisnews.com/userfiles/tuxemunilobirevok.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/048baslhnn25134j0emfveisjd/69945389576.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/49811595328.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/31308512102.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41780559c---50291725967.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae07c7c955---81461408487.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/dopexodefepenudowudewulo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076527934e2b---11797840898.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/0eab09ebfe3bca2b0bed9d0c5734e586/fibufaka.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_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10628 bytes
SHA-256: dfc6b3c6b8881cd3f7c468674021850dbc0a567d39686472491ea8075c068cb8
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 16200 bytes
SHA-256: 12b95400425ab47403422be2c311d6831b17c5584e56fbfeae7576435229f6b0

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