Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab4681ebc642511…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 23:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae516701dc00ed5220a2a338956658f3 SHA-1: 909fe9c7986aeb33030b8ac39ba1ab0dd0288aa8 SHA-256: bab4681ebc642511b2a92930d66980281bb9ac2c72fd981b08fde0e0e092aee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=probability+permutations+and+combinations+worksheet+with+answers PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161472e43db7ee---69783832778.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/8524409371.pdfIn PDF document text
    • http://clickvay.com/upload/files/92105631106.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/11933919586.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/2378780747.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109111245126005.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/lubalamefuvumetesefebum.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5a6f37500---95519926488.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/virimapogelezupevugopu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ca46d0894397b6164138fe74a585ebe7/55538504374.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021982349151759.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/13439424565.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/61641001056.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/24647972417.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/temojuvizumunafezir.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148997b187b5---kidutinelo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f516f21953---83233114127.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/80301259355.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1c4b16bef3370d3a41b6a22031fe5833/kiruzenogepizimug.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/86013825806.pdfIn PDF document text
    • https://ww150008.linebot.net/upfile/files/20210925090655.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/33920160080.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dakolu.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_off0000ae9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 14444 bytes
SHA-256: 8c07d3c2966517fd5c5db060e2c43e1d18c6507b95ae7353f1c503d4dc958ce3
font_02_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 11312 bytes
SHA-256: 661647340b2e27a0df36009e768e05a82988527655e5454c65dd4e86e130c7ae

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