Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e279988278c89e7…

MALICIOUS

PDF

77.0 KB Created: 2021-07-27 02:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b209ee3d3067131a9cc56e5c3c2b11a2 SHA-1: adc887bc3de55498f154b957e8cd92f46294155d SHA-256: 4e279988278c89e7a8b515e62a95ba82877dd51c0df1869c3d74ee5a537a83ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for further distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd9e64106---19197711908.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/zaturewesavuwufefex.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a93da59f78eb16369da79e755fbd92be/wurepasepakebel.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3e7156be9---zosixazo.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/vuxowufabetakudu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68a4a7e0b5237242ccda009f7df87d01/8441722346.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e40df86e858b9e55ac3d812a3c8fcadc/80347660053.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/3bb733b322e2831a38ca33ef4406a683/4915249602.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/25539350545.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/boremudirutazagesibus.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t3lkkdq55b9is0bqulnqc9cnn4/majotujagefim.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd24832313---nexunilotedug.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/fokomepawerufufid.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/dasemezajilafoxolekuj.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/23ab970d560bc96668fa10a73b25b055/58328930238.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/84009093660.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/82763049757.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/68682094023.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71cfd96fe6---tanunatezele.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/801383542.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bfd0e9f4e6---mexaxotes.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/92492789245.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e835976c0---60894731760.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ea5a559ce---4222226609.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/67526581865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=libro+de+matematicas+cuarto+grado+primaria+pdf+contestadoPDF 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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 17312 bytes
SHA-256: 320bfe5783fc3dbf7f96029cb5507f2d3360207d415a96911138cc8f2b7172dd
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 11112 bytes
SHA-256: db62748e5b8e67c0c994f243bc659f1259afecdd17d7a3bfeb827b7b42430566