Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfbbf20fc0644fb…

MALICIOUS

PDF

95.4 KB Created: 2021-06-26 02:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 14c8aced772b9b2784e30366c3b07e81 SHA-1: 03425ebfc71d66750a57d63713bff47be22481e5 SHA-256: 1dfbbf20fc0644fbcd792ea8f667d605b8cf8c6920afe9ae114bc866967e8e21
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, 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. No scripts were extracted from this sample, but the extensive use of external links on potentially compromised infrastructure is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=michigan+country+concerts+2021 PDF link annotation
    • https://pet-fashion.ro/mm/file/90695494263.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e1f11a49ee9eb27fd713bea4cbf60f6/19229553500.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35145197164.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/46b079099f1ae17211c8082d542e55eb/wurolovibopa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d78bf20ba---tipemunidomatozinageremir.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/topunamixaba.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/67478d2d046b11c43f9363227f18b75e/55835884592.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1a335e650fd1d0bfb3bfc7eb4a6a31e1/nedewewer.pdfIn PDF document text
    • http://scro.ru/pic/file/73742285669.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4205d03eb5---62391308223.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2lehiv729q106e7n0vfu717k9n/kevutiluzilodixu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/jemelumanow.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6c79e6949cbd4c914dd63fb17f16d4d8/81581326261.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/125ab6f8604fd2dfdd23154b8712916d/refiro.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/71507647790.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8704b8cd---baralepatimameta.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b0bda889---26719039963.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/e4928e12f2eb55f03c88008850a3566a/28972340205.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99089e83d---64818136141.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ec07f7143eeb964af295e3edce6a3a57/nofaxewutugukibovud.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/74419134769.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n4lhm7shbk6hbm755b5ae0kcr5/pafaretedijevuruviganodez.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4e3hs41bbdkh6n80170cb4bo1/46622631638.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_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 18884 bytes
SHA-256: bbd49caefb548315e1b30079d97f8f2f4696843e363ef4c253902f8993dcfc92
font_02_sfnt_off00015696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 10964 bytes
SHA-256: b3ed34a78994b1cfc5e6d98b655e723477a0f114ca38e5ac75068f9da54a7601

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