Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ada04df76cb1fe7…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 03:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebd817129cb14931a703ecc325e0ed88 SHA-1: efd455f880191d71d986cbbde900f284fdb3dc12 SHA-256: 3ada04df76cb1fe74bbb2b0708f27c7110915b3f7e896d41dbdf19491e489075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, a common tactic for phishing or malware distribution. Heuristics indicate the PDF is designed to host a large number of links, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f5b5f098c---notanonemadofarugerejaf.pdf In PDF document text
    • http://autoscuolecasetta.it/userfiles/files/5482262158.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611597c796d7c---88141126917.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/juluwedagazebiriborodine.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a764c119ec5---47105213921.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/67312950078.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce55d89ae---junikaga.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501005912140897.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/93125952339.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dipubav.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7beb126be---risedakexofenosebimowaziv.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0745d040a---kizebasekijuma.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12f6abb13---50148481771.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992277b23ad---kalakugexud.pdfIn PDF document text
    • http://iringmalaysia.com/ckfinder/userfiles/files/49195678746.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/vekotilumirerap.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/majike.pdfIn PDF document text
    • https://mauspro.net/upload/files/bugodedakov.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/89601892368.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/94364241790.pdfIn PDF document text
    • http://htwy.com/upload/file/razapuwozedusuj.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/wamunavavav.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/16051765161.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/27832065642.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116599dbda5c---mibabefomififonagixufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=why+is+new+jersey+called+the+garden+statePDF 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_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 16648 bytes
SHA-256: a30dc1b74036ce7a85fd4102430c53ba335d4f67a45869c01705064b7a45c0f1
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 10852 bytes
SHA-256: 36e13e65a0d544294fafd7f8468d27cddcc45983360fbcc69be34f149e08dc23

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