Malicious PDF — malware analysis report

Static analysis result for SHA-256 547fc6b8aef38156…

MALICIOUS

PDF

102.8 KB Created: 2021-07-03 11:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce9efb0460ab6eb2f7f3a062a0416c0b SHA-1: 505e22b27e2ce5250e2cf4861cd5e04f3cb9f194 SHA-256: 547fc6b8aef3815676e19e0256c4648cf191c3a4ae6f60458d7874d0e566ea35
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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=class+9+natural+vegetation+and+wildlife+pdf PDF link annotation
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7ibr8nnbrvhme4c9urinc9vaf0/52856769956.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/459de13afb8cbf0424d643df3a8398d4/mukure.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cc1d00faba422f90e0d2d82adb9e3397/zebif.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076001e1a0a7.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/fejudakorubuxavomujukowiw.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/nj6q0ee8o6stqu3kdmt74ojahr/zufijarosatatipato.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9836eeba94d8ee8fd2f056f0444fdb75/14051458476.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/zidida.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/63600491920.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/noperezinekibi.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/24083825229.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7578409e---87283412528.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2eccdd338---40120467386.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xizaveregedabavab.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/450583122.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cf64b785---zanibaj.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609030969cfb6---ligede.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc79ac1e80f---wifabejas.pdfIn PDF document text
    • http://thongthien.vn/upload/files/belesudebibebeket.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/tutelatanofejidakitarol.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/wubizisasodenajirogewu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/od6939f2menkq4gmjvratitc9k/vuwevowufinibobi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b826386ce---lixusaremivake.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/85898094000.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 16840 bytes
SHA-256: 4cb8cc225a755ab2dcd5cd2690d0a4c53aba21290edae88e4509fc9b863634af
font_02_sfnt_off00015bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB0 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_03_sfnt_off00017156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17156 11124 bytes
SHA-256: ff4164a10805556600794c26266a57a15b0c9fcd1672da478c0f9da3dc7ce203

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