Malicious PDF — malware analysis report

Static analysis result for SHA-256 0316415132235867…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 09:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dba62d7a2f5b08626e3a3cb6511d3241 SHA-1: be0b2e8a97f3edd2e59bb23e98ba8c34f4a21358 SHA-256: 0316415132235867e6997c6059c062280a5e5351a0d2c299340dc134ceddbbe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating a link farm structure pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external resources. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jasz-pap.hu/UserFiles/file/58489128951.pdf In PDF document text
    • http://anindecor.pl/files/file/3579064984.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/24524479750.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/penumiteleza.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/jovasipipawagiweduxosiju.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/99937323060.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/tipifirowa.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0531036dbb5f4229c93dfce072ec7688/gaxulujite.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/migalaxobarakodajoxaxoxew.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613608b5c2e11---pezejupetutelokusagatasov.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/lezuju.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/40930145022.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f42d774d9---29781588122.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///42055211279.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/tenamonarolivivax.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/27992998219.pdfIn PDF document text
    • https://kimcert.net/E/file/3611277441.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/wokabifo.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/15906123930.pdfIn PDF document text
    • http://gekon.net/userfiles/file/58526440856.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/98c18cfe5cfed45527d6105ad57bb07b/polivizuta.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/29569912007.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/25400680981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=technical+analysis+of+stock+trends+by+edwards+and+magee+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/rulovodakinuganitaki.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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 18556 bytes
SHA-256: b8bdc62cc0117925e92109b56ebea4e2c3a3a1d3e6a898c5c1010e9ea9e98f84
font_01_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 11460 bytes
SHA-256: 4cb4cc93f883717decf454e9af63231fb0840e11b27cfca3fe676b87781ebfa9