Malicious PDF — malware analysis report

Static analysis result for SHA-256 eceeafa831ad610a…

MALICIOUS

PDF

93.4 KB Created: 2021-09-22 20:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 30a98fe256067b930e4ade91b86b7f15 SHA-1: b08021657f58f1b3e0d8e0f13e0282e156d62005 SHA-256: eceeafa831ad610a453b93763e830b28582d5db2cf28eb82bc015babd225e3c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS uploads, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=android+dice+roller PDF link annotation
    • http://sanalights.com/admin/admin/uploadfiles/file/31831742819.pdfIn PDF document text
    • http://ch-yang.com/upload/files/najife.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58854961147.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/85047775495.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/bivad.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5e54r9vqad5rj9hp0nc57s1icl/mirano.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/bajibuzeje.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/dagedojaga.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/vaxijebijimuvefuvosalor.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jidagadulesakep.pdfIn PDF document text
    • https://tavio.ru/files/file/73880220039.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/1534128673.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3608b8485---xelomumiwurorovewara.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/patuwotuxivukepo.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/belemiwofulunobewijezake.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/29629168128.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/49926799132.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/lajabeniji.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/67859860412.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/razutubutofidop.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/18154759323.pdfIn PDF document text
    • https://balticseaheritage.com/res/wysiwyg/file/2991722649.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d34b974994e414e57cbf6aa2ef11d4c0/peborasibidizuzajenexe.pdfIn PDF document text
    • https://sino-islam.com/upload/file/210936218048.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_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 18856 bytes
SHA-256: 9bd61272d1d43f616bc58985f0ef6714aa69a2054321750afaccfa1b230b1057
font_01_sfnt_off00013a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4E 9916 bytes
SHA-256: f8fd4c2bd4d40c8645f95025b89732a6cb230675a1888adcda7713a509071819
font_02_sfnt_off0001503a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1