Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff9320b92e3f0ad…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 01:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49f48f2e00ed0b25bb00e5a1c342a744 SHA-1: 796f3ea906601bf315cd4717d58bb976b151fa83 SHA-256: eff9320b92e3f0add1a40c441779f2334adb00663b0335d41885cb1026ee82b1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cecprint.com/images/file/49747401582.pdf In PDF document text
    • https://cncunse.com/d/files/xabexibozurusolakas.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/64731784139.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/faa03fc4efabf6622989722b78251501/99146545935.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/79091492334.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/50859989427.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d51d36cd---94079909666.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/68185329090.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/54215574806.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/78977688444.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e12aea46a33ebc0e14345eda41fff674/83658524176.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/newevekudajodiragaj.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150d83a3e55---sotulenatizavukefowi.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-06-24-07-47-20-TyMn7YFE.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/33833112782.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210725163345.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/pp1lq12hjd6958k3avup36qe3n/tanetuwupize.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1629622373pawokab.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaff7a9fc9---zexoz.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/84101272463.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25774a2f8---dogawemarukulifezu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/detasikijobumenojavobi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d544bc065---91233781408.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4a5c502eb22038a01bf84e6a09e9fdcc/jigopupini.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/fidesedofuzajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sexy+video+hd+hot+newPDF 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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 18416 bytes
SHA-256: 2e363e8e784b9b1600f58b2945fda55f4dbb3310de17f8d53c63a79ab8aa6323
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 10312 bytes
SHA-256: 143e9796d1455546b3d46b5c0e7cfc722d9b2f2a2ff6b9444e2d8413944b4c5b
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1