Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cdcf1105481541…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 04:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1baf3a81a570f22174340003e46bc48f SHA-1: b734794079886d66e38d4933c507d346a8053243 SHA-256: 54cdcf1105481541b949ac3390868449fa32ceadabf595dd30f0fa9755fbb538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded URLs are consistent with phishing lures, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=personal+daily+expense+sheet+excel+pdf PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b18d22749---67124838181.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106191743105336.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gapipo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2ed0dcacef5a2d8083ef8c66b346a550/14392506462.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204489a695---sezoluzolezizokimevuvu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160973fffaf6c1---tewuxakogima.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/kuremugupisitesuwopo.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/zawazajobasudikuxep.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/67255076463.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/hds2465jnau2ckujue1ii2l7q3/33585489027.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/57461541914.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/98232028243.pdfIn PDF document text
    • http://nature-revive.org/files/file/panafafobazuvu.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b445ffcf---dipitoj.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/79439545159.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u9u00ej9vfupg1u3jji3in8i64/sizisokanesisewiv.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/47069657617.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/v7ftnbgvsqfosh106vptqrsok8/680736166.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3db116feb3bbd5145907d49fcc61b607/zumirelasotufugasa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2a1143b45---14256230995.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/675b8b4aadc4200541acc83f4da30ff8/70944067622.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/34620625868.pdfIn PDF document text
    • http://africareview.in/userfiles/file/mumeri.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c685295a---2325465147.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16916 bytes
SHA-256: da0f5ae579c8dba587fd1f497d86579cbd1b78b0857a5909d5fed7fc457710d5
font_01_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 10932 bytes
SHA-256: 974744f3c94b38e973583f8bc5ac05d725f176093c0ee7b23e3da66841c9df18