Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9faf6115104699d…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 21:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 979bad4cfd663d051666546c6b9e27cb SHA-1: 43be92b2775f190c4d78659577a04800d302d6e1 SHA-256: f9faf6115104699d4b8311ee1ae81c9340bcc8684b5c302bcb60408347012fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. 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 0.9964

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://infrive.ru/uplcv?utm_term=chomping+at+the+bit
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f8e5a302---10449909772.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/eudafki7ji7rpiv6h8i3pnah20/gitepi.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/69jgrrngjfmpt7c44min2o8ler/83373772207.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f111dcb772---porajagusumatijuzavu.pdf
    • http://jrmhandling.nl/upload/file/vawijawifonimegi.pdf
    • https://atlastoursntravels.com/userfiles/file/xiruxasugib.pdf
    • http://banghetretruc.com/media/ftp/file/roladazigosukide.pdf
    • http://mid-europe-ex.com/images/blog//file/bapelelidefafan.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a80a619c---watosufiluzijevadevabal.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d9bfac0162---793632293.pdf
    • http://adamlegal.com/userfiles/file/88948571960.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c36d4e19---98604550088.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/tubozovizupazabexukegamo.pdf
    • http://smflow.in/admin/uploads/file/nolipovimenonozo.pdf
    • http://obasekiestates.com/UserFiles/file/suwodafova.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/eleck6v46pd1afhhp965e76qmj/kowukemezonegus.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2b6b1411d9c914fcd1bb4e7b9c209552/rovemogi.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f14e8ca9---24910959264.pdf
    • https://humicdp.com/uploads/2021-06-12/images/files/38608277298.pdf
    • http://alarcon-v.com/editor_upload_image/file/79356993089.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/xukasuvuxi.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/647b6f1acd82a2148b8927014723e94d/59069463282.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 16792 bytes
font_01_sfnt_off0001046f.bin
696e2d6c30e2ca342ac57bb63808df694a43cf024bb603c91a5acc4492464bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 18312 bytes
font_02_sfnt_off00013360.bin
a099f3ccaf4ded4f70b31ec2e9425d0bc0243dd9b8c373b91e3716878c07b7c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13360 10556 bytes