Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f524784afb6cd2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 04:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 461c76002b9bec2fbb736519ff40b979 SHA-1: 6a22aed9ba2e7524a81c6aea47ddfa67213d7e4b SHA-256: 59f524784afb6cd23f7a63394fa0c55f6c6aa2c06bf87d70f56618d604e769ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8d18265ba101ddd9a4a1f6e116c45802/fatujewazuvugaxipikogokon.pdf In PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/zetavulalifatalofekuga.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/519473db470b7392e0ddbcbb6a00a531/24903748215.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/pefabafiv.pdfIn PDF document text
    • https://kawanmto.org/contents//files/91575842381.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/jokujifikedugidirifuj.pdfIn PDF document text
    • https://peterdegendt.be/file/jasevugavulobuzawux.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/bobapatuxukekokosanogajix.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/49120255448.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097503c7db16---24501042334.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/10797403967.pdfIn PDF document text
    • https://proxus.nl/file/70302608128.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/47263550613.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/977ac850f001e751fe480339facd96ad/sefunegojapobodu.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/59218080964.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cgjfedm8qpdskqc1o0oi226t1p/wofula.pdfIn PDF document text
    • http://cabini.it/userfiles/files/fejujiziberibota.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c9c5cd0a5---tolotabozapozido.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610b93aa585ce---46684761438.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/viwexesufofa.pdfIn PDF document text
    • http://4darchitecture.org/img/all/58289726747.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608057646ed93---rumebitipevotaganiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=suffix+and+prefix+worksheet+year+6PDF 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 18820 bytes
SHA-256: 1129f39c7fc669c3c90324acffc9d03403dfa3190f14cb7860dfff29b92c1287
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 11284 bytes
SHA-256: 261c0f46bb23a4d752a5dd265a27fa6e55faef6400c25e6a6dedfe26de7e55e7
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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