Malicious PDF — malware analysis report

Static analysis result for SHA-256 8495a30d968e39d3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 00:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc8a081bf8141c6a733a155e71098dcf SHA-1: 2af0c03a451f6d1f26bb452faab245d7b3190cc5 SHA-256: 8495a30d968e39d30928a305533676b239486b3bb1e261dd4d1c6a0eebef3147
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dominoliberec.eu/images/file/files/44949666730.pdf In PDF document text
    • https://indreninepal.org/userfiles/file/62394020986.pdfIn PDF document text
    • https://mcsfood.com/images/file/91348383412.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/78722380608.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e63a80508---1752810537.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/92553396719.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/wepuwumexijivaxutitevipen.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138bd837d7---wizonuvibilaki.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/busit.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150df739ba19---xifajudasilonok.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/nafixozibor.pdfIn PDF document text
    • http://julianina.dk/upload/file/naxefedeperegulununokaw.pdfIn PDF document text
    • https://ckmandarin.com/uploads/zelavonan.pdfIn PDF document text
    • http://klinok-saintp.ru/files/82314650108.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/99455558306.pdfPDF link annotation
    • http://hibertek.com/image/files/20210925_195238.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fofepekokegitubaxinadepos.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/grt6o2u97h24ctfeoefl1keqf51rpqbc/xidezeseketisoji.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/tinavezob.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109240248158741640da0c.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/simovesigesolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=messenger+latest+version+apkPDF 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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 10580 bytes
SHA-256: 8460eb48c7f01b5583a87cab35f6874ad0f6e6911aeb8f9cba4a52c536956be6
font_01_sfnt_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 14964 bytes
SHA-256: f58b38f28aa41e9af9edb049e354bb78f477e3906d0cab16c807f13230902dd3

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