Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2d95f02a5eb029…

MALICIOUS

PDF

98.9 KB Created: 2021-08-02 02:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab31c54fef72bc4d814060d9dc080853 SHA-1: 290c93f8c93aaf2b79d16e1d451693c855f4a862 SHA-256: 5c2d95f02a5eb02951cbd0d4c2af35438613c03cddd02ff7cfaf576295a6e45b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://advertisementnepal.com/ckfinder/userfiles/files/26790762521.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b42861bf3---55660956719.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aa4b1615980cbb8b94fa3218f225dc5/gikasotedubisetimegutez.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/29268974910.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93739024264.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/80825846731.pdfIn PDF document text
    • https://begili.com/uploads/image/files/9387900702.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/64326314541.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ac69bb63c7324dcef50bbf7561538cdc/65338164517.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa8f7c8cb5---rakoropuguzorolisizejune.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/12108451571.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0d7039715---tusenesibup.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/34845857995.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/fisiwojevixuzolovagelofa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fc73dcec---biwudovukiviwixedow.pdfIn PDF document text
    • http://evola.it/userfiles/files/jutujumuto.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/kisore.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vonozusixosavuturipelujo.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/29681201741.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ddb738322f83a718fc0bcde67e0dbe40/jofawisepilakijedixebewuk.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/zekiv.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a047f05a---17071558965.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/71376999060bc481863331.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb80f4e9f1---4479909565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+most+unique+girl+name+in+the+worldPDF 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_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 17324 bytes
SHA-256: b19f8199865dac0ba385f9cb6f168b50ff62af25196f6eceb48ac4a8bf3c07f9
font_01_sfnt_off00014b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B47 11020 bytes
SHA-256: 33652bdac52c798f79faf3780e827e3e51db0e6a8a3c4a6a8ab3d8fec5e3c6f1
font_02_sfnt_off00016444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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