Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93db3c746ba9c73…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 17:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 614adc5dc7293e073b949ec448175acf SHA-1: bd43499aad8e13da6b49373c6dd83a3b5e0c7422 SHA-256: e93db3c746ba9c73a5671de38be984cf62397e35b8a6b10dd9641960dfecb525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=funny+roller+coaster+gif PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/aa6fc7e00f9128ae6c7f9825eefcabd6/tipejid.pdfIn PDF document text
    • http://opersan.com/file/sepanisezanimetevesepas.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd50f694---vavusiwasigekaw.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/gitulufipumase.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/pizunipubalakigubi.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/26483296245.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/74798970690.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43371ec3---modemotunezosufunejizowim.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/wugizafu.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/jefofoxedevepabogeso.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/wubafejo.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/43875778472.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/68675474492.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/76447974106.pdfIn PDF document text
    • http://njxinbell.com/upload/files/1967335291.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/sofopilofeni.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/15994305948.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/16408018422.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/47452609125.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://vzxfunnynimatedgif.blogspot.com/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_off0000b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CD 17044 bytes
SHA-256: 398c74a30a4ad36e4c7d1a2c581a074c1dc73f1d39dd4194f2e82255a797fa4a
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10700 bytes
SHA-256: f4d03a4dfd7fc39e9f86deca664273a5d613a0e3d7fde82458f4b2f3b12cebfe