Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b962190e8362d24…

MALICIOUS

PDF

88.3 KB Created: 2021-09-09 00:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6913ee00b3bb250921d77452036931e SHA-1: e3d6650e5ee062c235a24aa1b3c115d1feaf33a3 SHA-256: 1b962190e8362d2452c1face4a1dbaed4cd5159546d3c8973d59896ceb64c782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and heuristics indicate it's likely a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=kof+um+ol+mod+apk
    • https://bursakaynak.net/userfiles/file/87784002900.pdf
    • http://lindendirect.com/tempimg/file/wewerudilozejamapeb.pdf
    • https://xn--90ah6akb9e.xn--p1ai/f/file/bezunewodarajidawiwipujep.pdf
    • http://stin-verdon.fr/assets/Image/files/gazagikiwebasalu.pdf
    • http://www.klimavill.com/data/editorfile/76978448070.pdf
    • http://herborgthailand.com/file_media/file_image/file/xosoxomuzelibapuv.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kouer1ma09kc1sp61e5r41e1sp/rikebataxizik.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/35236472ba2bdaff4539ae44b0e5a822/rikej.pdf
    • http://cpviettin.com/upload/files/fapizubezomiwelok.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/bupinasi.pdf
    • https://univerosg.com/ckfinder/userfiles/files/rewuwegov.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/40638031118.pdf
    • http://topoint.net/userfiles/fckFile/20210906094809.pdf
    • https://fentesmakina.com/paket/upload/files/99897185604.pdf
    • http://cn-biyoute.com/d/files/lorojavavipipulobupamasig.pdf
    • https://mamo-tato.ro/userfiles/file/geruramolugelibazuroruxiw.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ae054ca0---25391527575.pdf
    • http://veterinariacomportamentale.it/userfiles/files/tudobevifenu.pdf
    • http://cbstav.cz/file/rupejadip.pdf
    • http://currycornersugarland.com/admin/images/file/kibitipokuboruvomumi.pdf
    • https://togelunited4d.com/contents/files/54155078046.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/91ba0ec425380402e0be60609d2cb036/84396904117.pdf
    • http://ariogalospspc.lt/userfiles/file/51338706735.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/4375536847.pdf
    • https://guapa2.com/admin/fck/file/zuweroxusires.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dd.bin
1e6b9874b58a2eb4fd8fbb065d00dcdd7b14ea6cf33b02c8e31ca7e9adfa3e07
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10148 bytes
font_01_sfnt_off0000ff88.bin
64db190ad96bf2b97c2111ed1c8e364602c952031d02bfbbf4c2a9ea077c0565
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 22884 bytes
font_02_sfnt_off00013b88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 16792 bytes