Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec13973ab008dbbe…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 09:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5a530279ae55a01ece244437c6cb88f SHA-1: d97100f27684cf4fa29e8929c4549b795229aac3 SHA-256: ec13973ab008dbbe9f35bb309cfe4ab87136a3b1c97acf1b96440e491018f1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ffit9dhouou98ks6ltnkksc57m/33239429371.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cfb1d56a2909786bc8bd25e67592cbb7/xoseserojazofewategitalar.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3f93524a---gadizibinux.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9ae8c2e0---durubit.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0465dd4a44---2116724938.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4589948c709e70695b5486056010cb13/26230281221.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ae97fbc0---65341764117.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/33504380198.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e515a68ae26805b2ede9ba2de3edfd19/lumadoriw.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/mogifiraweme.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/9761332793.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zokawokozetotasizefuz.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/76313122649.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a080bdb83---40611655866.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/jigixujamabamudomup.pdfIn PDF document text
    • http://drironcat.com/images/file/povizogunebesimenot.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/95822102337.pdfIn PDF document text
    • https://vestol.bg/files/file/vofila.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mijeneduxujira.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/edp2ol6r6875fj607243tvcfu4/pedafejan.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a5ab668d8ac28cff9dd623535f7e732c/xunuronotolozovelewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bimanual+compression+and+massagePDF 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_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 17432 bytes
SHA-256: 8e12f0a110c751ccd9f6a6d3cc660abdcbbe9ec732ff5dae31eaf2091be28594
font_01_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 10912 bytes
SHA-256: 93ec30da3af1dbf169c158c83133331efd0211664054813cb9c786e7f844bd87
font_02_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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