Malicious PDF — malware analysis report

Static analysis result for SHA-256 373ba584928cf3d9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f4cdf3b42f03cff52b9a20c731fedd6 SHA-1: b4d313424fb90e4f4f925da2e4e5f6ada73ed42b SHA-256: 373ba584928cf3d94ac5503147ceb52dd18c0f2ff03b13388d41ecc3a8c61eb6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://manpukuorder.com/uploads/files/96578491132.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d836a978e4---jadiwuxabulu.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/53382781643.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6glmksgd4pikh5lhp06pj29i10/dovotedozugopumefazipe.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xulunazinoletuzebe.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/11475532025.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8a63c5ea098e1111db60b4241cce4562/zibij.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/manabiputodazobop.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c300f4e6d4ffb0e64b8fc948e53773cf/16714379353.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/xagewo.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108101541087757.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8fe1ad9---xativotifuzel.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/nifixop.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4a62585797b389ac9997ecd756e11de8/zapewidaron.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/o4m3ornhmhur0obcim8mm11jd4/dasalemagigunowod.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/26808654716.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/kasifegebimuwerakan.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nipawumarenanu.pdfIn PDF document text
    • https://primer-spb.ru/files/files/guzovej.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699969f6fa---bewetifitasajotonida.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/eeb5cf08b6eeef2e1a2f2a914679fada/87852197777.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/93937015949.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/jofijerevemajonunotitipeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ejercicios+futuro+going+to+will+y+presente+continuo+pdfPDF 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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 11048 bytes
SHA-256: 5d215ca8f80ea574a8acab75f9ff518b6e508bd246ce9e2b9da8693370865406
font_02_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 20372 bytes
SHA-256: a14dbe70b52135b24ad5b474c3aad737b6e6c8b11d275c5e72a3c57b011ce3ca

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