Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dc47c6d8d3316c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 20:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1af5e1ab1670b71bf92840d4dcd18deb SHA-1: f31f3450936aa030c5d2e91edb7777b24a3003e8 SHA-256: c1dc47c6d8d3316c3a8ff82393d186141b4eedfbf3d559dd6b3c789ed1b6f30e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The primary purpose appears to be redirecting users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.verimevzabavu.cz/ckfinder/userfiles/files/72026256340.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607692ef5653c---36292823390.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/33788209416.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436b2efbab---18118944156.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/mikinagataguratademobo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d2a65ac3---tupupijiguvolugozesade.pdfIn PDF document text
    • https://brod-plovdiv.com/images/xurebefufagupelekolep.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7568cb0ca---maxon.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc57b87e71---vegefewuxupeni.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7d7301fc---nopibisumififizomalijojid.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/paditozaxudogexotuvofakaf.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d678d033489e0172dda5c98844c1d7fb/55356067187.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/40143205887.pdfIn PDF document text
    • https://unaizahic.com/Files/files/sidafimosabexesojol.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/kotuvi.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/64945128947.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021080712101273499.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/83480574515.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/tedatosadunisitij.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f956238288---65859285793.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/tamarugejoniverewakiwir.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/novoxawazop.pdfIn PDF document text
    • https://wittnebel.dk/file/gamajixik.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/23625786714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rehabilitacja+po+alloplastyce+stawu+kolanowego+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_off0000d0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B4 11504 bytes
SHA-256: 2c365e169d7637785047ac64a28cb6eb133448c1ff389d65aee204d862a8620a
font_01_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 17220 bytes
SHA-256: 424d9704c7706841c274d79cbe12c34c80b14cf986d4dc1a418ca0b3aaed535a

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