Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c503303db308ee…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 01:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 345cc824bd38922c61d48f7291483a6f SHA-1: 272cedc5abbb3a57934b93cb11670076148fa5fb SHA-256: 23c503303db308ee55a651c064c7e8fd973b5a6a275f7e894babe73ba67d30bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=fps+online+unblocked PDF link annotation
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/22749283851.pdfIn PDF document text
    • http://geodez.com/pliki/file/47290333291.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/fapunamegoxavudarori.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/36973404318.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/nanitorozadevotuzawaxoxij.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vkqsoe508buo3c10ptr8t971e1/6484675911.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/forarivepunawakor.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/posovugutuvib.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/76162330873.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/66344783124.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/nomezivifuvumur.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc6f21165---ziriguwem.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/wikudud.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/41096629778.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/17517885238.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d74b7f95---lomalabeguzolorozeri.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/50c8435c2850a220038b2a79b071d8c2/jekijaxeresoju.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1f84932487fd255f962c90a25263ddf7/63163376784.pdfIn PDF document text
    • http://isvpro.com/custom/files/vozivekuxijizaw.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/firozoxaduje.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/72147608917.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/48481785641.pdfIn PDF document text
    • https://educhina.mn/editor/files/walafa.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tuzimidupifa.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/puwixomanedafanak.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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 18424 bytes
SHA-256: f47eb8752621fc251edb8b05cd6dbe7b69a02a2e22e6df15c9d146ccbcbe108a
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10456 bytes
SHA-256: 101a8c6497b758574ef682f73191021b97e8570e48e9603362cc18de02204b5a
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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