Malicious PDF — malware analysis report

Static analysis result for SHA-256 9355faf4e5549a70…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51b42bdcafbd8021f09a65baa6e0db1b SHA-1: 1fb35ade390c78bfb2b9043877bc0c617e0bcab7 SHA-256: 9355faf4e5549a70026c6c46263c56569de8efba75caafc2f48eb69ddddc647c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://oikoscoccatoarchitettura.com/userfiles/files/78208289865.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4e2shehn9b2es547ns5n315usq/dibawefatevexomosija.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/jemiwaginawerivagap.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/65663699219.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104034aa310d---darobusizib.pdfIn PDF document text
    • http://yejida.com/userfiles/file/25818293713.pdfIn PDF document text
    • http://sun-eko.eu/files/file/62005855397.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ab50d6987c068fc35455fe9c467a4db0/8501061851.pdfIn PDF document text
    • http://metallpress.ru/files/56631942798.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6ce1bbd31c84b84c657bed6778b6762f/buxixirapasinojab.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/voluwizosexolawojesif.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210726_2FA734D37DC278C3.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/56767810152.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/bukofa.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/katogidodokela.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/povogoxek.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/29675567095.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b06766d53c8---pokixiwipowoka.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ft5vpj8n4ajfl5nc61kot4t1ko/muputinimulobulel.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cf583f83---fetifipagagogupejimeg.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210528054631.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/28810170828.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/98173200952.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nidipodewezuxeka.pdfIn PDF document text
    • http://beiks.info/public/file/zatenizomefikelafovefa.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/gotixilotojopoxipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bts+wings+album+lyrics+pdfPDF link annotation
    • 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_off0000c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 11204 bytes
SHA-256: 59d7493d0823a19539f3732508daafcf3bca5746e61e95c6dfad408c43d42dad
font_02_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 19432 bytes
SHA-256: 642620500f19034d7e0620d15a250636d915a5691e30dca6b23ec387862aceef

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