Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99c2047bbfcd9c8…

MALICIOUS

PDF

73.7 KB Created: 2021-07-09 07:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d205339bd90d849ff811bdddecd644dc SHA-1: fa06e3b8158cff60f5469587bde6f7e81b34748e SHA-256: d99c2047bbfcd9c87a38244903ea7c43d788390f54d96549d1951dba12bb9a3f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. This pattern is commonly used for phishing campaigns or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=heights+at+carver+hills PDF link annotation
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/587bdee36b09b19a06693141d07c4aa3/wuredijivurazited.pdfIn PDF document text
    • http://hnysft.com/d/files/pekijegoviladopagadoge.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/pu3vm169qhmpb366p7i092spv1/lemiwakufowolekonotune.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/15r7e62tf43158pa1iibfmdocb/16654317665.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/69jgrrngjfmpt7c44min2o8ler/83373772207.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7fba4f26d89f967a9022f487d802b42/vasaxatazavadosevulirasij.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/8732001583.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f203c3d5ec---zuligiverekumukifapon.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/23037fdcb08a5d8fc509bb936558a448/93324685773.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6b9c6c7935c8388cf2b409a1d6c93274/43974091449.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5403f306---67529430773.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/mogenovimanozakodelujuv.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3161f7017990a03e2f393050ef67d2d0/69981400662.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/xoretulovezenajutot.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wezufexabuzosezuzukad.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/mipudonetejamirij.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbca7af92f---29479709766.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/n3hlkc2s1ftqo1l6a0cepf0m7j/fijinavopumatoxawifefuzi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0b3d1449---wiluzanuwamosuka.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dabd57ec42---60406707022.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a360b5d177a107a6aec34bc6496d04cb/futepoduludexotavozodinar.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/dovaf.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6add2e11374fe37a61be21d5e0a446ac/68849913028.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/bagomadedulozafadogelawug.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_off0000bbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD3 10344 bytes
SHA-256: 7c5ab680626068dbeb38a0ee8ee742dad9a638a2b62edff5d9df1a89004dacb1
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 18368 bytes
SHA-256: 472d379bb36821503a0763d1edb3b96177267ac6a0ef11c8f28bed5ee08cdd1e
font_02_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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