Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bfbe004b60331f…

MALICIOUS

PDF

96.7 KB Created: 2021-08-20 07:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d6bfc22322cd99f1d9396f82a5e1206 SHA-1: c006585d8356fca6f8c2c3b1822e46aef4832ad6 SHA-256: f3bfbe004b60331f2e7c75acecb490b288aa76dba5f3c67e1f2b95e00d9a5455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://losmarinoslanzarote.com/marinarubicon/admin/file/kosawemozi.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd96002655---govofamamaduj.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/snaui2gmo010fvp2l6icn1a6mq/35692419717.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210805175212.pdfIn PDF document text
    • https://medicula.pl/web/uploads/files/zezitutavolejitujuk.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc74d779a0---61556091831.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/48709268345.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/munuvexitexobutev.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/36990180325.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/19627191566.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/19148738286.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97d2bb077f7a6cf653b916b1279661da/83171116085.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/14960032953.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/torusatitesonopi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a91c07d3afc19df6cfba69387483217a/sobopukupirabimup.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/janifetewegojaludamerobe.pdfIn PDF document text
    • http://stringladies.cz/userfiles/levuwa.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/bafeg.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/laragebi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/20687454460.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/xupomewowop.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abe14410294---viloxiw.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/57055439018.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/43081a30d911d1ac5fcdca81651d9277/mudebudigub.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e433e191ad1---finunemuwefepibazixizux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=history+of+sunu+african+dancePDF 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_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10628 bytes
SHA-256: 5a4e8eb355c1bbf228e65b4f84f3ec3d0dcc99aa4be67588c484a4b3e5f359e1
font_01_sfnt_off00013156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14968 16836 bytes
SHA-256: d5838be892b485a15e89fd5f49f0a7aa0e507a51a6823fe6887976234b6de18d