Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa687d46eb84402…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 00:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3186799e7b38f92697b2493f15f49a9 SHA-1: de40d8578fdcd069eda81daf6f22648da524cd3f SHA-256: ffa687d46eb8440218a64df070fc94ac08490895485aab136d8213bdd9f499a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary attack pattern appears to be directing users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161059a354f56b---rawanosivekevazulola.pdf In PDF document text
    • https://mahae.hu/files/files/22561969689.pdfIn PDF document text
    • http://mousike.it/img_ins/files/2749078658.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/ronibebifu.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/16912343067.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/29814333511.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vig2u19g6se1hkpg81o4nu2gc6/37993105135.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/95427297776.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/bazofamexuzafamapiba.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b7511d26f---jefawuvi.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/vifomum.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53c923e666---nekulipulemelalewi.pdfIn PDF document text
    • http://darec.sk/files/files/69703894857.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/fimizoz.pdfIn PDF document text
    • http://industrialdevices.in/uploads/zaful.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a320a42fca2---litadiko.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/rijaluxalafanu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098c07f89c04---4499772832.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/nuzaxoduzazujurad.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/51187428501.pdfIn PDF document text
    • https://lod.la/images/news/file/fofaw.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/65808584855.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/bosoz.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4bb0f50e4b7bc8384f99459246882473/marakoxibiwisogusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=imagej+3d+viewer+manualPDF 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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10708 bytes
SHA-256: 9930e09f75113803401a7e2b1959fe227776c6abd8346e4407e898dc31d41fd3
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 18652 bytes
SHA-256: 3000dd3989a4555a02d6aea334491a38f34e400131ad81cebc91ace93e309b66
font_02_sfnt_off000134ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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