Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4509fe8a10ee53e…

MALICIOUS

PDF

85.8 KB Created: 2021-08-17 14:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8f2630e240c230ae236d63ec9a04053 SHA-1: 39e51cec9076408360f4c8bd9faa41f57f1936d1 SHA-256: d4509fe8a10ee53e64b662a72a0ecd6be94fe1b28d79b8eaf63f1a3023e9c100
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack vector is likely spearphishing attachment, leading to exploitation of the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8b8faqed0huvta03e45u6jak45/vedevarovuko.pdf In PDF document text
    • http://jaika.in/images/documents/files/litugofap.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bffa44dd---xumomakusenuz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/23cp31i0t9ql0sjt42trgana9j/votodaxujiwodifonewu.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/pabupewodozutitasotixi.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/57241141810.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607700f00acdd---34109209818.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a06940da0db---felitalewozomevibukatoxu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/79788938842.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/172291973060c6483eedd8b.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160886d5a2a976---87743892928.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/283f1dc02cb97bbcff069e08fde53e25/nomoretiwafomofinidiges.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/43716835412.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/gojezimubalaxiwolif.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076b21a3b850---18245408096.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea6521d426---6794837323.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4f1fa07ba---zuzewolo.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/47371289010.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b12fffffc5f880c8b83a91d56d96305d/29998090259.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/jebizere.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2jqi8k2q0n2uokg1r82qhu5h2u/45024732800.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/51260816201.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440beda3dc---53739193993.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/jemega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=rules+by+cynthia+lord+book+summaryPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/pujetij.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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 11128 bytes
SHA-256: 38f8d86fa116094034817e78830b87663878f26c95fe93d2b9c568c96563430f
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16952 bytes
SHA-256: 113c17dae3ea5416c269253b3d1acaa42e0f1ecf7ef8df3b64533ba4e3a4eb3c
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1