Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efdc8397fa084c9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 00:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9da7a19a58a13bc0549c0d6eba24aa40 SHA-1: 16e35e8a325551b23248d0528098fb3e676a5a32 SHA-256: 3efdc8397fa084c93d77cbdd1268279e67abd22c0641f7e7890ebeb8a2e89917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e752422561---lalugakuki.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200791827978.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/sadaradejovanikirumuroge.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/sumezadedigiwalogogojo.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/39509647685.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134337a0264d---geloxafesa.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c8dbd6d9970bcfd34532ad10824eaf48/namili.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/45060388202.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ep4gbjjqdhb8v33iv6dhqjkgq5/gaterubopibenavodag.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/36655619707.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/gebesu.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/bujunijowunufunopavowe.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a46895f402e---weramazusojugumirabas.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072723095263.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcd543373---65375815965.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/tikemivoriwazukidavag.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa96e5eff9---godin.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/zisonibijolola.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/097b150541d98613ba76e2fd1b821aec/rezulidexezijiwevolame.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/8936219226.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af9640251cd---35030620468.pdfIn PDF document text
    • http://beiks.info/public/file/ruvogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=spelling+dictionary+english+to+gujarati+pdfPDF link annotation
    • 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_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 17896 bytes
SHA-256: d122495a52cb1552e8c3c64f44879f393918d8d578e2d503e740428eae334a27
font_02_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 11316 bytes
SHA-256: 9d18b6a2b2158c88e52037e5e629118274b4782804371bf2884186059e9b751e

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