Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e9c76e4772362e…

MALICIOUS

PDF

82.9 KB Created: 2021-08-07 08:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9936df7b2d97c439104a92d53b9b8cc1 SHA-1: c08f972411cf50ed3c85a9b39583c37fb6c883db SHA-256: 46e9c76e4772362e9734d5623052bf35cfb808cdc6f4312512f90dc53f696546
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. This structure strongly suggests a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://visionbrindes.com/admin/fckeditor/userfiles/file/21045006394.pdf In PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/30674304281.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfc6eeae8---28542428846.pdfIn PDF document text
    • http://tms-operation.com/upload/files/83180754462.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/dezukifunozuriwixag.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/zedifada.pdfIn PDF document text
    • http://prograsifkalip.com/files/20481450795.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759dee34168---gegutob.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b436d85d6---visidawuzowudupesibolusik.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/witiramuwotuwofikuvateweg.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/bojirunulim.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/winamozugu.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/tenivovujazadixalofosow.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215141242345068.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d810d897---womefiguzebojefuvesulimak.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vekijepivaviget.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cda57fc0c77595f9419a4df342f94c36/roxejiveralukewusowog.pdfIn PDF document text
    • http://abnicum.com/files/file/72299257003.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/92943553903.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/69983656365.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/81982801347.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b2088b7a---58707090261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=simbolos+de+diagramas+de+flujo+programacionPDF 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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 11312 bytes
SHA-256: f37acd41111e287fa8cfd1cec652f6fb3276e8fffa7101d1267f527661ca7ac9
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16724 bytes
SHA-256: cb6baf372ab664adc5d6ee78513441a465d341d77991b68da517a08d6b195a65

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