Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b60d541d4eef71…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 04:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05197c685607ca8d4b84b12dcfead9ad SHA-1: 2e3f5e2b71767c93391c3d27affd4b3cb1621d4e SHA-256: 87b60d541d4eef7170f8634c6cc52e706caa9faea2d2b195237202559208051a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4710dd9e8b---75372835637.pdf In PDF document text
    • http://xiaohecollege.com/d/files/webebipevijod.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/62782838715.pdfIn PDF document text
    • http://jump360.co/upload/files/20210616001313.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/8246212623.pdfIn PDF document text
    • http://gdaniec.com/upload/files/kinurulif.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/43c2499d1a3b6a4b47f532cb763e250c/45205572698.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a915429d8b4---71541051775.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b733ea8a4c3267180498e11d768f10d5/7467173078.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ivhdq61sr6fv8q607ia0vctqb8/66784452269.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mazoguforopuvodur.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/25667727621.pdfIn PDF document text
    • https://qkon.ca/images/file/72625538167.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160810e9cf335a---52465409783.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/buraxexeruz.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gokowubedaduzedutoraj.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/cd9e0b993fc3c19c67f482fc23c8726e/mulugogopabetakawuw.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f6c0637ff---99363886473.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/sijivifodowu.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/89094515858.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b60eb2803ecb41d12c4ffb3d115bd3f4/kojugelixoxigidufikov.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oj679ncf62lsqntbrm2ucm4073/78376355848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=beowulf+full+poem+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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 18168 bytes
SHA-256: e546099502a7395bd92daee30294834ee916b773f4bba2223f283537fc8c108f
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 10176 bytes
SHA-256: e7b00947cee70cede1d73449e0eecbac0d8efcb3c587673ed0b2129a994b3129

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