Malicious PDF — malware analysis report

Static analysis result for SHA-256 85408b77e6360d38…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 07:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7b124fdf7c0238bca02a8f13d0b89f6 SHA-1: 78992880a90b82006a618c56ff5020676172782f SHA-256: 85408b77e6360d38bae09cc5521a11ba2738c257ba51583c0f208ddb426e8b6e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosting other PDF files. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/cf44b150f57307bc93f81342311db62c/tamimezusixakagalotox.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9fbb2524---42858076616.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/moketazotakekebol.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bkoup6dsdc2jd410v356nd1v96/69258238316.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/purixajivefisol.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c329b073ed5---29152015828.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f41c1f9b3---82163325382.pdfIn PDF document text
    • http://cartopack.com/Images/file/49435868929.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7dd4b017e29318ce63f6a950c9e0e159/39457473032.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aad89b72d---19570023994.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/disesizaxe.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/12694699631.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/64481127798.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/walamenejobag.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c156dad993---49896627475.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/fajomimozev.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/sii8q5h0i7psvng3piug6g0ee2/84702837641.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202108311733561426.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/poputoxeveperuji.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/018e8080d21bfa7669a7373b9c3588eb/83769166810.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ddf0301f6218a6f28f40dc9be0f16ab0/zixiwitimasodosakan.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/ronitovogopuvenajo.pdfIn PDF document text
    • https://italvaping.com/file/mopewolerezubupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+to+do+if+a+bat+comes+in+your+housePDF 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_off0000bdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFB 15808 bytes
SHA-256: 0ce015fd5b8ddbfb334045198440ff62106065aeda626b56f90aeb7f3b2db8d3
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 11040 bytes
SHA-256: 0b40409910922efd32324b1368a4841fc5d9abdc388dceda0224cbefc157f256

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