Malicious PDF — malware analysis report

Static analysis result for SHA-256 271709f82d1d1db7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 13:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9fa61b9c37ac39e4bf32308142506b4 SHA-1: 087840945989a00bc9da6ee1467453818ac8aca5 SHA-256: 271709f82d1d1db7e3c3cc78c384a62c470d8f873a276f465a6b726567617c54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709358ec20d---925565500.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c96acecce69d5549de09127be85151b8/sewokixeguvidisa.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e3a1d95aeec0f4a52a45e0c84e95670/kigadijurakerozalupejuk.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vebet.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95589b979---tadalamopifusekaxiti.pdfIn PDF document text
    • http://farmina.ru/uploads/files/82075874016.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/36482785339.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/85419186986.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608129f846ae2---doseregekowezogutazuxa.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/92619468974.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210630/file/16250416328308.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d6f730b9---38199390093.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/82784326242.pdfIn PDF document text
    • http://rooptex.com/uploads/26635391208.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/99319058659.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089d24836b77---garejajedufavaxu.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/54107224986.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210731055215.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337bec81e1f---vusenovitiporarufitesu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6po0mj2doumjrnchfuv6nnf4h3/92182757692.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b496de230ba085074a533fc95290d63c/29552203784.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///14186560275.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607920c9e472d---17200462291.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/35125712348.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n320oskt984t7kajdluho9rrgp/tujarono.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/nasekawepijavuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=antecedentes+de+la+comunidad+lgbt+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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 11084 bytes
SHA-256: 8e64f1fc9bf33444c8ab48d9cbc4d3ae307a75cf8606aa9c92de94297dedd4c6
font_02_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 18788 bytes
SHA-256: e346f93fb3e0a8bf063d7c0dc02120b24e0ad3d551dc16609ebc4d622435da27