Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efa33196c59b0d8…

MALICIOUS

PDF

125.1 KB Created: 2021-06-26 09:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1868ce5331685bef627b335502c31788 SHA-1: 129f9f398abc250031869c6c96d8925cfa70d805 SHA-256: 2efa33196c59b0d8c030b1d18f2ba474c6a4b73ca0bfb4ecc47e375670df4b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://wastran.ru/uplcv?utm_term=memorandum+of+association+of+a+company+limited+by+shares PDF link annotation
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mcia3evsofascjunkbrpn4s8dr/tatixol.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lu72ufgt2c8q0pn4q72u33is47/zeferidiwalozafozanape.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc883cb9b5---fesulon.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/efbd495aff57539aceccf37901f69f3d/vidalenatulu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab7636459---26635872965.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb3405438---45593200225.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc05357e3---dakirujumiwojulu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65c469762---talofulorusetabivipifiv.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fuwer.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/79449568072.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/68523467267.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hfg41d1tvohvondaujail3deto/xugalu.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/nuzejexataxowepogepizon.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/03d8165ce62e920c61be0bab1df06725/62932487494.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d48bc72ded66d0e9d55895d40e2c0882/24318292939.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074978f7b225---24768700705.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d2e9891028eba4b09eface55a843d815/50838008216.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608271adbe949---molefutibus.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/58126259486.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b054afd148c---32232877897.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074743dac469---manuzesalob.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/53935058520.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/dawovujipuku.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc374a9d13d---304292767.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/24314372642.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dd667b86b---gefipiluxive.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210625194648.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_off00018891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0A8 11232 bytes
SHA-256: ff5d8f852bd985c0c4d83f3a492a767ab018d75864bf2920dce9be34994073b6
font_02_sfnt_off0001ba88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA88 16780 bytes
SHA-256: 6652fb5c9f3f04d6aa50019f5ef091708f18f972ae35a253d72d24bfe4eb07f4

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