Malicious PDF — malware analysis report

Static analysis result for SHA-256 541db491bba40c6a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 04:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c243c225705ba909675a929819ac23c SHA-1: b2f030cf9e4637dc0dea6c29f93258804b22b7db SHA-256: 541db491bba40c6a281ecf62305977ac576e1144099e81d5a36f3edc0970b9d3
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0304c55dda---zivokifejuluju.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b347eb326b2---wedul.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f734f7036d7---jazawefoluludiwajonomunor.pdfIn PDF document text
    • https://bselink.com/userfiles/file/duwelakak.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kurijuxelumifosemiwol.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30c33380---rufiwalujagiz.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610481e998ace---jilurati.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8703cf21a31cc88a1be04c0a76f46b53/17100116313.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/688e9ebbb283b8dc03492e26acd84dcc/31011827718.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kgti9bjgk9huk3gegkunhb6ma2/digosatojibasi.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/lewivijaroxeforoxeposir.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pivmkh7ku6nalshef0ov6p1i1r/talelomotuz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d227483ada---49341709058.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e701ce79a98bd7cdf87fe598ced097b0/zujawaporazotu.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/tomamafotazobupesepu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90915d2da---92298263366.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa964df69c---kigosumilusitupibopoxa.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/49814974806.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/somekanibivelizawef.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f75a5a461---29624909242.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/270qpov4msvfebfrf32ooc696l/54805592676.pdfIn PDF document text
    • http://sdds.be/userfiles/file/84762723147.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/vawadisuvekigigun.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/bupibiborokivabemik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ldc+exam+book+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_off0000cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB3 10464 bytes
SHA-256: 32c35dcbc44446731796d6f9fb623fa27b84c9c059e23f0600105c9df182bfd9
font_01_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 19128 bytes
SHA-256: 9e342d4bf7d33e0ff1b1910769d44fb1f89b588035b39e6df0e0528a84b3aee9

Open this report in the interactive analyzer, or submit your own file for analysis.