Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0b4bd0bb5b45b4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 13:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f083ff4ed20d3a60fbc28a0c5f549696 SHA-1: 9d80053576fe645e358e1d5bf79bc1b98f0732c5 SHA-256: cf0b4bd0bb5b45b4dd1467ba5a3aa07228722cb6d74d2a9fcfa702b88552217d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites 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 distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=world+map+labeled+equator+and+prime+meridian PDF link annotation
    • http://gibisch.com/files/files/17542625016.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gofaxidoxexexipiloliwe.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b487ed12f5---fovasapowi.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/73596932835.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/noraduvogikutumogibari.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/kufoboxeduvul.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/71694098072.pdfIn PDF document text
    • https://songhong.info/userfiles/file/kutogamibutedaxuguzip.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2ba3bb9c857822fae348520a056be988/64070918429.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/3227127510.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/kulalazarumiruxikuwudeku.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/vevazaxew.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8986c5ee---93963767621.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/346f8512480a707ec1ec55e423e45adc/ralumabapuzawufilafip.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/89016018062.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/tajikenodizasudizezawuvud.pdfIn PDF document text
    • http://envigest.cz/upload/file/xawon.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/nivunijokomusuluzafepum.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/54741448836.pdfIn PDF document text
    • http://rafaelokazakov.com/file/75944586321.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/xusemesexe.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387d2a08f94---42828155711.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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 10764 bytes
SHA-256: 3f299ec99c3c8b121e61a177857f453737c5db9390b9fca63fa7700257d11087
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 18812 bytes
SHA-256: c38b3b2bb60e1fecfed91c6f4b6e69bf6222fe8516b631d69f1c01089d55479b