Malicious PDF — malware analysis report

Static analysis result for SHA-256 753a9287f41147f4…

MALICIOUS

PDF

94.8 KB Created: 2021-08-16 21:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1533c769c291ca0f390f0f668a6db934 SHA-1: d36ad16818d2b352f10186ed2b0ec4cb91ba150b SHA-256: 753a9287f41147f452d1573ce59d99d9c0ddda1c8e2c1db0a1c8cfd105038bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://nomylo.ru/uplcv?utm_term=what+are+the+different+types+of+stock+indexes PDF link annotation
    • https://www.jakketoes.be/ckfinder/userfiles/files/11590839977.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161152774217e8---kowujolunaxitekuwomude.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/96984072791.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/80204449563.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/58494611055.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4mv0j6l7o5d07tekbq40a53c17/luralifim.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/xuzusi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d9b92548---wevow.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/fd83dd051d39feaf12660e8666a4fe9e/fukezutukom.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/zufilakisafe.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e706fa6b09---13694464715.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a1b6e0d4---97567201523.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/zakiwarekeja.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/nuxegipuputikexomivokiziv.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e3ffe018365c01e1c4165ea3c5832158/69416729306.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c83hb65eqngn3eorvc3vl1hi73/18719948.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835d0097ce3---95783426276.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/18055193429.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/26660290964.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5468534c---kusisuxezera.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/88455546057.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/regiz.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/43929232458.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f3624157d---96940088564.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/musafekuj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf9a33f90---50588553717.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/jazaditoredokigogado.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102a1200b99b---resumatokizuselejonu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001220f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1220F 18260 bytes
SHA-256: 324eb2976ece47f81a106d63bed40911957730693e012e915c7002966ed773be
font_00_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 10972 bytes
SHA-256: 03d9895b2aac135210b37e1aaf68c30b0817dd4aa8ce8b30b25266becf52cb81
font_03_sfnt_off00013e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7B 17440 bytes
SHA-256: 6793e1002a650a8eeaeefbd87ddd59a1b7ea836d271a5c126a732f1a67989dfd

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