Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb92154a87fcdae1…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 09:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc9456675c691868788f5c483b84d3b7 SHA-1: 767b8e4a198c7bf532a7f2f1115d8673710ec385 SHA-256: bb92154a87fcdae128c7b2b3f01416365359964d94a848352d9ddd48fee82406
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cb98bc4d---zenidekiwolujasepe.pdf In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/43488190081.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e265de609a205b8422a8e222cab240b1/75646511516.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/34100466156.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/95023429881.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/86960281265.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d393e00102---taged.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/17648558975.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210630103503_1527294548.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc7cd1c07---gepotuluxopopovuzojojeb.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/7274607723.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/siribudiwulojovikajozu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/63vik57s07joht3j7onhfm6ago/61350121414.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/36474313346.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9630c85b63---40790705365.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/lurovuloz.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9dc74003---46252638273.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3da8a88599a47e00cea1b4e80a988381/8758472925.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746751172b3---dafebadakenane.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/buwojevap.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lexuva.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/zuniwepefogerewuvivolizon.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/fekofukiron.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3df3ef260e655fea329f3bf8357bc4e9/47345058084.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/24e62a181d7507013dac77cf4cb111cd/7131428852.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7ae78ca3---laratevuretek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pine+forest+near+mePDF 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_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 17552 bytes
SHA-256: 166abff2dd3c9486f4529176cd307d4a718d7ceb0aab2abbb40c935e89ce9ced
font_02_sfnt_off00013e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1C 10328 bytes
SHA-256: d07ce534a65c7419c53dad84691081319e7a9e828d9fedb35c7ba209e9e1c105

Open this report in the interactive analyzer, or submit your own file for analysis.