Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82c9cb274b2d299…

MALICIOUS

PDF

93.5 KB Created: 2021-06-30 03:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fb2c7b7b8b53250fdcb9518d1095c573 SHA-1: 8bc40cb4926e97926565afacb1182557d9590746 SHA-256: f82c9cb274b2d299f07d1dd861a050721e3b3efaa46bdddf0657d8e8247085d7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs align with techniques used to obscure the true destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=path+of+exile+marauder+build+skill+tree PDF link annotation
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bffd92ff5---rokodolonuninedotogirono.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091ff8657cfd---3295874140.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/35921265934.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607949788090c---juzidiwububemuvub.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3d61aeceebc2b1ee33f4a38845be72a0/78656296774.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/14913906447.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b6155736---vuwaxokixinatuweposopi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/pigoxixawoxisazolakitak.pdfIn PDF document text
    • https://negaratoto.com/contents//files/zexatogina.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096f0633903f---2408880200.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/44787743444.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cb54115d---mazinegeluzas.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3bc3af6bb---38412052128.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160975f692bbe8---81670963506.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9fa43201---tufagiwexezelibanara.pdfIn PDF document text
    • http://berbun.com/user_img/file/16306275262.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a7e1a165887d9237faedce865599713f/wisagob.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608864d17561c---60009768509.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e2c18137f---duvur.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/6868350b1bc5f7753b0d458e57e7db29/38868506747.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/o69cfa55ahrmkl3n1p6tassgqv/gakemiloki.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596fba74a6---gadepipuworex.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a4e7db81---29045720609.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/42710477527.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_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 10948 bytes
SHA-256: 40dd1edc2c261913a1b3c4bfbbd9d32215128bf76afe4910aca34594fbc90e90
font_02_sfnt_off00013b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B12 17320 bytes
SHA-256: 7c9d9f0dd60aca4f4acf49eeb999e95ea6e0bccc80030ae2300d4d56f0186cc3

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