Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd70d51f47936d52…

MALICIOUS

PDF

90.7 KB Created: 2021-08-09 10:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d84e9619ac2baf92240cfcf4d93931ed SHA-1: 5c27d270386d2f347adb3ad8d192b03d38e47b55 SHA-256: cd70d51f47936d52945e5463e86a7bcad32b5ceb9a2bbf8f443ed1fc89e81866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of PDF-specific link farm indicators strongly supports a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=how+to+see+if+someone+has+blocked+you+on+discord PDF link annotation
    • http://kaies.net/upfiles/file/37584962300.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e376839a22---dibuba.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/41682208792.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbf5cc895---24724876665.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/28283747624.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8a1958307537e0f004ee4eae3232bd86/52319111911.pdfIn PDF document text
    • http://haki.vn/uploads/files/72069348148.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/galos.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ngak9bnj8vjl4tvse225fipgr5/63046561836.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/lodoso.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a49598c8b2f91c0ae262785450511e9c/lozasif.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/34a665eadb3939cb84e6098ff1136937/worazoba.pdfIn PDF document text
    • http://emannsltd.com/userfiles/60034682988.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/jinez.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/muvebefubez.pdfIn PDF document text
    • https://amblamy.ee/upload/file/keniwamepisamofan.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6123a449f---53433963358.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/37945929773.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efdcd93d8bf---15536456837.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/71035096478.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b54599bbe794cb9e58b2788c036a63a1/vewuxuzakaxipinopot.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/5182168490.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/74b95a1db331927610349c70f39a7a4a/dujuniwufajalatekotonom.pdfIn PDF document text
    • https://2acontractor.it/images/file/dajap.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_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 11264 bytes
SHA-256: e941355c988de420edb16362c9072c47b6860d04d084add06627cd77b6ac33e8
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 17576 bytes
SHA-256: 0d9c8ea7d9eb32be860f758875b7a9bcac4347f0ba82fdadb602440003fc5943
font_02_sfnt_off0001417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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