Malicious PDF — malware analysis report

Static analysis result for SHA-256 80862e301c9e563e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 20:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2859bb257c5c00696e6bf5699412d4a1 SHA-1: 2994e1479fd7744f5c0c7f34b8472c1c9c3a4fa1 SHA-256: 80862e301c9e563ea84beed01160ba932a24b2fdc38fc0bcc8c61bdd8946ba38
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://najlepsze-w-polsce.pl/uploads/kijimeneximisotu.pdf In PDF document text
    • http://upasamed.org/Content/uploads/files/mopopuzemibiz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9c6f0a07d7af884f68ac6d18aade6f7f/risojudovarug.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611455758ddfb---vetiwafupokelizixo.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/jobixesetut.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/toxebodovuxokugejatewibo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab55e7c0f---mamatudukulame.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76174bb50---pirewa.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084317f8eb7d---88892588016.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///nuvejaxubalobiw.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/vesibisusogavexapovipagu.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/89510760154.pdfIn PDF document text
    • http://4bx.pl/public/file/wajupexuboravazifakexowes.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd49d29d2a---62569798052.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/watitunat.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607139105febe---32651576802.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/jekevuralaxebetoxelepe.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8065b5c8d---25675821218.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21461a0b6---3363034415.pdfIn PDF document text
    • http://podushka.by/files/files/gafukodubetozaludoxis.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/jidenotisu.pdfIn PDF document text
    • https://limsurempat.com/contents/files/25348807888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=biology+short+questions+answers+for+class+11+chapter+wise+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/75566385674.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 11448 bytes
SHA-256: 9c5738299c0c16557677e2a7765c565b75a1615ecb8c02c672654f5050b7700d
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 18080 bytes
SHA-256: 04a82d43cf37c4ba8b4272107b0759ff91e95fad8c66fdf29b362f26e2c225f6

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