Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f940f3d44a4122…

MALICIOUS

PDF

84.9 KB Created: 2021-09-24 01:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70b93f74157fc565964d700c9bcb5178 SHA-1: fac3581b5eb499de98a2b5729164669501613fd2 SHA-256: e8f940f3d44a41229f893e13455b47728a3d5403b5e33f4d5bd6f228da55b671
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to lure users to malicious sites, potentially for credential harvesting or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://km2804.com/ckupload/files/22570292875.pdf In PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/vugomaxupimezopoziwameta.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/29742267047.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/nojage.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148f3c00f94a---27520102979.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/puwojovokalowuz.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/tobufufu.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/moduxokuv.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/45200149003.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec2e95d1e---56900127695.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/45352120078.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446e2da75c2---7722125880.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maralagimaxewovulijefi.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/88096413296.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/96746490836.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/42741769287.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/cb10df79dd38be1d6cefc61f17791e53/48088693524.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/bepevilerirodasudar.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tudalanarapuga.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wameterefigeg.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/xapafefogenogibaz.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57083260426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=antutu+benchmark+ranking+list+2019PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614858516ded2---siwufumipovuxaxirekisom.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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 18280 bytes
SHA-256: 6f0fd0c977cca83e9421e1a1b24c226f97d10845975ff663fa196096c4864b00
font_01_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 11332 bytes
SHA-256: 2a0d1e23e77c6b77784f8e698fab1b0e7fb6e1ee46b6f116d7561e4720d6d675