Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6650afff6f8b02f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 19:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc6051d19c69c8c0e7418ec96339dabb SHA-1: 5f6785fdd7098a9a5f70a0f5d1c9e3dbe9e400bb SHA-256: a6650afff6f8b02fb2a217d741e04f59689cd4b860870080169a6ede142b169c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://garglob.ru/uplcv?utm_term=mh+cet+syllabus+2018+pdf+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987aef3da38---86819243689.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xopuvofilopuzomirulusus.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/72462392202.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/japexuxerutesazul.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaa6a76f2a---32854598158.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607798b730bc4---bupoteletimexugaxojobomir.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/9743399452.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613258d36f377---fomijujajamupevuj.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16117f26f1557d---8854838172.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39fde7098f---24547501059.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210616163327.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/97076699843.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/nuvujopuxajodun.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/36826609654.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e7b377aa---dolituxowufab.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f957e775c4---disadeximuxelirofe.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/61643916848.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607733e42e8a0---11781428269.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08716eb516---nufilomuxu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/lubokopozejojilarivafebas.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/oq5rbgpta3moefkd880kfiid94/kukevu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/52901769837.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/mesadulukexozerajupiwi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0ns0i1ig5l4894geqtqqhre4gg/24558001424.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/16772543659.pdfIn PDF document text
    • https://lapdonline.org/file/xirexa.pdfIn PDF document text
    • 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_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 11460 bytes
SHA-256: 0962b748c1eb9fdd707d30fcb7baef52e32802472bae98ee13ea8349d91a025c
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16508 bytes
SHA-256: 884899521d9ec308f1ac01845e67b32ab6a08dd6546c31ba3465bc4a725ef965
font_02_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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