Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16f6a221c8107fa…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 03:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1826b0827312191a38e4a906098120ef SHA-1: 3f53012a58dac9174a65c3377ae6d773622fb03b SHA-256: e16f6a221c8107faffedd6f3603fd8aae7c6453492e7d0404baa757d3efaa068
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rodixuvukabamuxo.pdf In PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/92154935636.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/37469099438.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/fogajelo.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/zofidilipefuradizat.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/70963345912.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc8e7d096---rawitukafe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16edba6b4---talugedidizetani.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/41731107469.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7cgithk857co72rgbpfvr89d74/24202304235.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/86957727657.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d80595866---82743940027.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobozaginaxanir.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9da54ade8---tikapozufofika.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenerixokovomadajumu.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/33172660810.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/danovuvotuganuzilemu.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/najefekosaperoduxezatozot.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/081aaaafe587adf78dcb1e9b81400d83/75316243106.pdfIn PDF document text
    • http://www.bandungmesin.com/file/21090547368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=last+day+on+earth+android+apkPDF 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 10608 bytes
SHA-256: e62d97568d6d5b1b8f111fade244127de8e5e928541ad3e72552853a61e09908
font_01_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 17740 bytes
SHA-256: bb9c387887c99df68dad4ba04b85d8dec2887de3f9174e3a5b4b2daed16408a9
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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