Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b2e4c38049ed65…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 07:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe4b9b499f71ca7e64ecb5056a523be2 SHA-1: ca558763c4639ac4e524460ddbe3b7c1541799a4 SHA-256: 80b2e4c38049ed6525aa47d31b8d4664546d3a1c0c3253918b35455c7a4ab717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure aligns with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=the+proverbs+31+woman+pdf
    • http://music-summer-courses.eu/upload/files/pakix.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9c249ea4---10937127716.pdf
    • http://risorsaterra.it/userfiles/files/berimitekupu.pdf
    • https://gazeta-msp.pl/user_files/File/70322784140.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/48030953795.pdf
    • https://bushregenerators.net/userfiles/files/67023072166.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/72333468199.pdf
    • http://bjxbw.cn/userfiles/file/xexowon.pdf
    • https://kodcomputers.ro/2664/uploads/tarasinubopojamajem.pdf
    • http://tecniagua.es/uploads/ckfinder/files/50767091564.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_22_56_04_5561.pdf
    • https://musikkursus.dk/userfiles/file/sedotasarirefovabodegip.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1cf45a5cbf4e04e6fd3ed3adc7321170/kepovu.pdf
    • http://esoftland.com/userfiles/file/dafejipajowanikuponi.pdf
    • http://toonesk.com/upload/dopujadabejala.pdf
    • http://soft-pro.hr/upload/datoteke/72110648438.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fe3c7b2cdd78fc58cee2c16553e7af89/fuzasofonukimitojapal.pdf
    • http://encino.kopanramen.com/uploads/files/58257968302.pdf
    • http://bright-inter.com/file_media/file_image/file/ruvovevuzowuxotozefot.pdf
    • http://molenat-energies.fr/molenat.com/images/editor/file/mopozigaxugo.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/77953354797.pdf
    • http://popnmusic.fr/userfiles/file/56645003150.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16792 bytes
font_01_sfnt_off0000f2ad.bin
bacc3f685e45512f0509e4313739192470fe3b1476e2786e8456ba287a6df610		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 17176 bytes
font_02_sfnt_off00011ee5.bin
c2c7081581e7bda9efdaad8e4f5c0d187d4bffc700a881018936a7f7abae2e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 11004 bytes

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