Malicious PDF — malware analysis report

Static analysis result for SHA-256 e637522705db9ace…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 20:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27a918aea82b3d58df6015b814766249 SHA-1: 397c1083e41c5f5047b03c85a213df509ce7b8b7 SHA-256: e637522705db9ace2e6994340346d24b957d0c91b47e936862210b950f252be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://medvor.ru/uplcv?utm_term=pdf+image+to+text+foxit PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102facda9947---wulivawofemefewexekoda.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f1669a296e397da95b598971a0647551/98606510204.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lr2mm8vt71gn98um9pke5og5to/368733735.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/rorupakeligiforuka.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/lewiw.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/favaxolepaz.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cp3l6ts1tuisnr59njogbg2cd7/vurixewige.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/tolitesusosupe.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvjap2co0nl06nfi1880hef7p2/63641909248.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/32794892148.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/sexuvonafo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/14405b73e3a90f45b552b7488c059e96/65780279190.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/69944581174.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/maruzujo.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/47208297946.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/xuremeretedi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b76eb403e37---87243827696.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gizugoj.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rgohji244bucnj2651lsfpq2ph/xubujipezavumopumaz.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/52284916621.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/nomuvowegagujizivolizur.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/manolu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9j4hn3vu33a71vfmgdmmcjj760/kitisebij.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210829_14D86F68E3A6565B.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hejuj63k4o10juf1qqa1sksvjp/94092263980.pdfIn PDF document text
    • 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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 18572 bytes
SHA-256: 2b5eb6838f180403f9563db47db0d9bce75a6db1e5278251b5624a6811ea1e75
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 10380 bytes
SHA-256: e88fbea91aaa7919bd37dd7df059f833effe061f228ae6a18eb1ba9439eb70b0

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