Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9b1eb291bc2d89…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 12:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94d351970027c15712a96a7d0600472d SHA-1: a38c4a2b292ef15de837c30d29a8992f7172854c SHA-256: ce9b1eb291bc2d899693e4d7a295f636f32043b393e56f56b0d4345234b8d50a
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, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=roblox+2021+apk+download PDF link annotation
    • http://pokeocncafe.com/uploads/files/ximisa.pdfIn PDF document text
    • http://pi-consulting.ch/download/29317596262.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/84178171284.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/1077721534.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612efb89a6296---63806446122.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/26021495994.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/69449548224.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0bc2f3fe5413d5c63892c7ad1a8158d5/19543854956.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/52303074339.pdfIn PDF document text
    • http://wuchem.com/upload/files/27940454242.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/vepedujomiveruvawale.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210921_2D68A278BE4B4E5A.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/74112949785.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161470c85a06f5---xakoxupuno.pdfIn PDF document text
    • http://kientrucqhouse.com/uploads/image/files/15753833462.pdfIn PDF document text
    • https://avela.md/userfiles/file/mejekigebejubapez.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11313556624.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jukisog.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/2907424905.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/32746495737.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/padazefuzebir.pdfIn PDF document text
    • https://securitydm.com/slicice/file/93408458775.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_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 10556 bytes
SHA-256: fadf48cf00ab2f1457e973d51f7f704d7f531ec06ea163665c0b123640953185
font_02_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 17568 bytes
SHA-256: b32fc33e9cc1d8b25e9eb7c2317151533409794603a88435e7c94a788ec1a35f