Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6f0700c16ba54c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 07:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 251308edf405af73afc4a0448feddae1 SHA-1: 21139b04111ff47523cb9a811b66beb89510c224 SHA-256: 4a6f0700c16ba54cc53fa2540ac5daacd0639bc891eba3e5801e4ddd21879f9d
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign to trick users into downloading further malicious content. The presence of multiple unknown URLs hosted on compromised sites indicates a likely attempt to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a0ed961d---nojigeviwoturafe.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/90c90e45f3767a5b4d3edce22226d47a/bakafepuwa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c26f5f84a89811bb67c5a9cdb8ce6fe6/14150496272.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/raxapuselusifi.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/867d1be95c61539fa48f5dd40f73f754/gival.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/vadilaxeredoxanejov.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/sopafitebefazunum.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/37092311294.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/67688195382.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/lelijiv.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f1ca2121050fd1a31f9d9a9485c1e348/30196993812.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/8358feb274cd7a8139ce0eba777d952d/ketomakoroketizuv.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c022eabee7---81936032954.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/pltisou4fe3gbrkhv289rdejtr/tabedixudemixujunonizum.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/33747160bc08b36565eec84a1adce358/99631523121.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/fovesa.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc2a3b08d---motasivodofegig.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16102d2e63eff3---97696945747.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/60138253416.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/vijox.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e3325d3b4---jiverizijigeguvobum.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/27439055828.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/tefufijawev.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084809f6191e---kuwamutimumari.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/boneromidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=monthly+financial+report+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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 10656 bytes
SHA-256: f761a417696e936549701ba0cbe98f72ade03d8d8866b24b3adfa3d81ca5abf5
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 17500 bytes
SHA-256: 77fa3db80ae19477ffbd78b999a1b9e0e81eb48131512a7e5f2e09c2225cf72a