Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdb36d0685b7da8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 13:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88487dc8496154a9d483953f06c18425 SHA-1: 076d5939368730dcb19d43e79e3b239d8ad23602 SHA-256: abdb36d0685b7da8069e5e0ded48a8ca08eb66b543ee5286b67148122a1775f5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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 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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/156123bfc3ef59d9b3c7d13324747aaa/61184172441.pdf In PDF document text
    • http://www.northern-japan.com/image/upload/File/lukew.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1629520767tafelomas.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e912fa6aca---96341855602.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/besematem.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/larufilajeko.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xunevidase.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/gexativuvosewi.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/wepofikowobiju.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/patajebozudinonu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/29736917481.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cf98fe6c---kexejavizakumopudogitegi.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/rakanilepagenileku.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611e9cf979651---bivanifadukekaxiw.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jng34b3g07fgt7ii62le3nfh33/korugero.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fe5b8c6de28b92bc6576e67e700847ab/xuwobeb.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/22608914467.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082314341ab8---8579955795.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/99334600460.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/91039197466.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/rexivolekilokuberevedegi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160821dcae4b1f---pokufazotuvusus.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4fc7edea---bitabofodofebiwos.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/03dddb3eeb56d75f50e79e5a5e804a7c/xijubavinisekesafugimoxa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9f60c5af---befaxuloko.pdfIn PDF document text
    • http://expresskaliski.info/file/53857486735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lithification+process+of+sedimentary+rocksPDF 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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 11000 bytes
SHA-256: c35f102dcbf77a249fe5bed44720b07ae51582182db07c5570303031c783b837
font_02_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 17424 bytes
SHA-256: 7c22dd4552e1d5317e26dba1d47686d696a9849c6ca09215ac0c046c9e39189f

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