Malicious PDF — malware analysis report

Static analysis result for SHA-256 468e4f50a3c0bb79…

MALICIOUS

PDF

90.3 KB Created: 2021-07-17 04:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aaad46d12d38fb6f050aefda6a474861 SHA-1: 396ebb429e28df5116e8eec77ce08ce2a00bc136 SHA-256: 468e4f50a3c0bb794842c0315d7903bc3c402355832b2fa41ef3e2c39a7e92ab
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 and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://elbag.net/wp-content/plugins/super-forms/uploads/php/files/a7d52e15c01c09935ce9a77e6faba908/rivikoxolonakupelax.pdf In PDF document text
    • http://noithattamphuong.com/upload/files/mekiruvufawenovozuvu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1bebc379---25471814224.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0dcea0cc13f23e6fa16a6ebd12477a12/tugabikafasema.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092249834f13---pulolevavefa.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/16053403689.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d6b2f145856b9379ee35d3b15c663de9/jovuxawipasutibof.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc4ec6491---mopukorivutatimodafazam.pdfIn PDF document text
    • https://soechi.net/userfiles/file/xibobabomagapenuwamutaman.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3918d2f57---39648509320.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/nutokapo.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/ravedexafefelar.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/noreg.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097173e35b2f---fejitolugifali.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b04698173e---zefepexofupaworujiviregi.pdfIn PDF document text
    • http://com123.vn/uploads/file/bawuwenonimozefitetuf.pdfIn PDF document text
    • http://mamitobe.ru/files/file/dutukesafipof.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/gaxubujijut.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/47kv5d2uu5j0fckt85t7nl4i34/83254919569.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xetisuxesaladozipepuna.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nf471ejrqvak39oeghc5cffbej/3790130756.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689edb0e6b---77821526239.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/botetukaduvano.pdfIn PDF document text
    • http://strandedtattoo.net/file/zijowivotorisesudeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=temporary+employment+contract+template+wordPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 10580 bytes
SHA-256: 910f5b61fde4d4f4f8f619501b9588b5b72b57c38b432bcc1f4a5c7db8de5551
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 2476 bytes
SHA-256: 9e66068f7408fdcf011ef1eb05c90253355693887616f61eba9e63f900eaa60a
font_03_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 17056 bytes
SHA-256: 2c6b95297b8a8dcb26967116fbea07c61e89050e16801bc6280d3788c87f47bc

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