Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25d973558af1153…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 06:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18cee06141b8c1f87964e577c3e15716 SHA-1: 165608013067f81856a09c22f1364838a967c050 SHA-256: d25d973558af1153c88c7e030f0f9fe9274afd4be66237d7edc7651e7bb0240d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the PDF structure and URL analysis point to a common pattern of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=language+acquisition+theories+and+principles+pdf PDF link annotation
    • http://gtlmarinefuel.com/userfiles/file/muvatudirugejizedila.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091964f7c039---zobojusunobupapaxusabim.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191f4d90e3---59273773589.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4ece8e2bbae852ea6357c577d3e89844/xowulixusap.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d9a7968f3107061044ccb8a3df94e21b/sumofi.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/pemota.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/subagabotetenebumap.pdfIn PDF document text
    • http://dalaichau.com/files/87003556974.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/zutuvokejul.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/vufobuwoxozokekas.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/92309883673.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/pikubupo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/77344595745.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/86323981285.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/86087170437.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d949a58d03e---62923565770.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c417217411a---16092805218.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/905670107609a068794601.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/49142753717.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/48272424956.pdfIn PDF document text
    • https://latework.cz/soubory/gagudigepov.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/29052180930.pdfIn PDF document text
    • https://icbacademy.com/upload/files/77921933058.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/daxawupujavusilibazafam.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9460aa5d1---wonutovaxokuwazev.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/40452287211.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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 11104 bytes
SHA-256: b61477521f4e0c86241e44635930139095fec6455ae34f516411a2e4f2926b56
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 17416 bytes
SHA-256: 2993cf7ee91ae293ba8b593b1333df11da87cdf97e6b0a1e8d0f94790aa91337
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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