Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d626a5edc1b97d8…

MALICIOUS

PDF

93.8 KB Created: 2021-08-09 03:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3005fc27be85945e1b86a747567e52a2 SHA-1: 3aa5d89ce9a88db0075ed8064ca6bf57011c99f3 SHA-256: 5d626a5edc1b97d879bd6dacd6faaf46ad862903247db3a10dad8a438079b507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://elijasprojekts.lv/files/file/fusuzujipo.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b167d3ca1a28a4fbad5cae6ef4ebcb87/gizitamuwozapuj.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79b4a1f5e---xedofofoduzosu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a87f9ef67ea042099e9a5c4fe40356fc/tevidege.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/ruliwag.pdfIn PDF document text
    • http://meta-min.com/files/mowadowezosakajilugip.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/15650027033.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/687f2535c757c702f55ecc3a629ed4ab/3773868101.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5cea3513.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zopanojuzuxiravazexov.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/xebuloxonogewo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0559faf002b8594c7905043dce1342cc/62817281783.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/13273281720.pdfIn PDF document text
    • https://digireg.es/upload/53915451382.pdfIn PDF document text
    • https://signika.pl/Upload/file/30337175960.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57759154334.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/23886951767.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/65332189180.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/989d3a00b109e47436860a7145f6e627/55402606840.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c732a30a005---20975970625.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/256fb1aab935c6ee3fcb22c1c5139c51/zavududoveruxelomelip.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/79983365062.pdfIn PDF document text
    • https://mmszke.hu/files/file/xoxog.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/fejegunepofojowaten.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/96922088284.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/xunudi.pdfIn PDF document text
    • https://blugarden.eu/file/12042802402.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gelek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kingdom+hearts+dearly+beloved+sheet+music+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 18444 bytes
SHA-256: 7e3a008114469019891be8314084cbb28078b648f13c1b25d960c66e0a78fdc4
font_01_sfnt_off0001295a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 2184 bytes
SHA-256: 4f2080f8c0cee8799d8add0e70cc40fe2552a1af2e27e790b77d35cbd3f0b158
font_02_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 11564 bytes
SHA-256: 911a4493e53fa41402836373689c83dd3ebd4e19b806579c5545eff545c966fd
font_03_sfnt_off00014e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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