Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f9a31c1149631c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 00:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccf0ce085eef9d59514f95d5a3855fbb SHA-1: eb4c614b476cd6afac96fdb2f09a48f34de6ae9a SHA-256: e8f9a31c1149631c8cdda8293a6cf937cad8d21460554bacee310282f5bb0b3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns are consistent with a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://divapharma.com/uploaded/file/70466526215.pdf In PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/8500303048.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/74257176242.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/xonalutinobajesun.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34268310855.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/jixolatod.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/sapodafarazuwizekujivi.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/92556448722.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/39423289006.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/37736600187.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/28b6ab6c18d4e1cbc91e34b3d2eb91ef/mopazeripiruwabewot.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ncan3u485s6pd9mstavhtqrvf2/kuxuvefedevuwefogatekegat.pdfIn PDF document text
    • http://enricobarraco.com/files/68768198237.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5398a7cba9b7b2db29d9fb36353ad690/tosaditojozexenun.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/91491954024.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cc966527af4569ef725c95badeedeb1/naroroxema.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/niruz.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bofaveleraruz.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fisuz.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/pitamu.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/40469183911.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0052cda69---91716785705.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/fozogebuluv.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363cb57e5c3---62386661302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+layout_gravity+startPDF link annotation
    • 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_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 19052 bytes
SHA-256: 3c64e28d51b91a8ed19e3cc13a9f8cb95d1c1d446f5c40bc74c57a34aae74468
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 10584 bytes
SHA-256: 4819013a449ecfe4d414d5e189a849252b123a2b1b2326aa00e7334933e46849

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