Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2313147f573909…

MALICIOUS

PDF

98.0 KB Created: 2021-08-02 06:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4021a238a4b61235817f4e53e7765cfa SHA-1: a9396503679a4aba2d5dd42a4327d57c848ec8e0 SHA-256: 5f2313147f5739094a8adacdf9cda437e64858e3ea96dc0f19cee5cdb11504b6
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing attempt. The document's primary function appears to be to trick users into clicking links that lead to malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://audreyheselmans.com/_files/file/68425491433.pdf In PDF document text
    • http://ipceurope.com/assets/file/30021145604.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b683dc5ce4b---mifabavid.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/14426637913.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/89707619336.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sog7jmdapom7cnq5tpj7ej1mdb/mipewizurirajalidujilisog.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210612005650.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/rodenazerasa.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pawakozo.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/gepotegik.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/17df484e18750cb0b6c79a35a1cc9528/xonawufenepabubodonelup.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7397953284279bd03237aef8a5cfa2f7/205787761.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/16095694416.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/924270b75134b16222f6b4ee8338eb5d/16583647106.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6904f55ce9---sogukegowuwopijos.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/bivakerekewefaviwakadisil.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528190520.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/faee22224582b008afae5907b5fef903/golive.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/21b962f5625eeec8d6e040cd31d79612/15918710696.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/bowilofawulun.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a925606e2---masonilaferufuzedeboj.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/7449087571.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7h2o28dkd1mcnf8foeu7eu6hej/gibatesusumapagoxe.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5c0013a9ffe26884c74d9c5b4fcd8e6d/jijuvujamavasolagip.pdfIn PDF document text
    • http://funperm.ru/content/file/81415210179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=macromedia+flash+player+8+r22+free+downloadPDF 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_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 19136 bytes
SHA-256: fba2cfa8ad395a49695a295d6c74d2813a8a1794b8d07e84e7b5b7670c59ba48
font_01_sfnt_off00014673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8A 11308 bytes
SHA-256: bbdf3d802798af9feade9769ebddab17a2cb0b46a6b01287dbf4d1234c867dfe