Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d9b5d454e0fcbb…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 12:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 234ae165e9524ccc826f01d89c88a7ba SHA-1: eed1b697d68e92541d595ae29fdf97fc6b829831 SHA-256: 65d9b5d454e0fcbbe59fed77510411cb4f6a63b4214210538f49daecdda6e9f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. Embedded JavaScript streams are present, suggesting the potential for further malicious actions like redirection or exploit execution. The primary attack pattern observed is the use of a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tivati.com/uploads/userfiles/file/bijinizedagijugavubonif.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0bfde8d37c9be8cae95b37712dfe055a/gofajojinazofogosemija.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/maperuzomipeb.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/sagoginuboramafat.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9ec2001feca70095d6acc60acbee32c6/xibemelemutewonog.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16ccbebbb33c3a64482e98569432af69/71401512816.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/74fe9d9ca84505ed85cd75412b600b67/roluralipe.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/10579614620.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/zopidobavuxomusezobu.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/516442236.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///33100957907.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/forovexugejugibilebupi.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/fivarafupotibedujuzij.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0db9d3f7---86838927701.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/7538084837.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/bezaxodimi.pdfIn PDF document text
    • http://apcmagon.com/userfiles/ralirazakezepisenodinizud.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4f49ede7e---jadagevul.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kixetoruzuxufoguk.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7b42ce599594db756aa557fbf68509de/5683788380.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a8718fdb38e---88805443310.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7213c7633061b12288bcb77de47fd737/45961360687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=months+of+the+year+in+sesothoPDF 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_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 16564 bytes
SHA-256: fadfc0b56da27f4b523662c7b309a9ff6412885e037c4972a4ee4ac955812d97
font_01_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 10372 bytes
SHA-256: d5cd3cb3b9b955e4214abdc3165d39925a6e63452f264159d8f6dcd6b22da642

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