Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be6db1df9ae0183…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 03:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00c9ccd9b28347669902d3706240070f SHA-1: 267a519afae0e0f9cb810c672be7b6dcf2a261d1 SHA-256: 8be6db1df9ae018341d1cb0129a9614d7e497819c5da48b7cf498c0af5dad795
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the sheer volume of suspicious links is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=traits+of+a+great+supervisor PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9237731ad---93786836521.pdfIn PDF document text
    • http://nktrading.qa/file/files/63627488760.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/604a69ee19dd83cfff9e965be82688c8/nekomovatiderefakozun.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/74834327878.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/livadusesorifirenoj.pdfIn PDF document text
    • http://bloomlight.pl/_bloom/file/pagixomutoxatoza.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/viduwomixudit.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095107f41f1e---biwivuw.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/31092924473.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/34349288867.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a9864c37507---ramuxifemudanoruditure.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e94fba9b96413bf8799d7487d1e478eb/11958168203.pdfIn PDF document text
    • http://bociany.sk/media/file/ramorejefemetus.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/92af23e57eee7260cb30e09c731307a7/95321100666.pdfIn PDF document text
    • https://aashianarealty.com/file/busilelafujiwogexuf.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/07ccf348c57065e3cedf668dee6e256e/jaruto.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d951a7edc---memow.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c0c32b83---84306316086.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/pevibuka.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607def391a4a8---40826299363.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/767221469d1480cf50ed4f30748e0e25/41435586249.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba132ae2347---fijowuvefuzowatefubokadil.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3c9c50d8eb704508e8af5b2da4760e0d/jijaganoponunanes.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/xotewedunidab.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vbj6v2karpjlnu6k8mdqffl617/55516662679.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 17036 bytes
SHA-256: 7b704a4c3f9fe27a5f1c31c00cb41c428a2bdca29bffc1db512e0982bc5d1e8e
font_01_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 10512 bytes
SHA-256: e41e04063cb8a499c328ade0db8adaf3cc87c6452ea31c98c43c0dbfdc33b313

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