Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4e084f1d25f04…

MALICIOUS

PDF

96.3 KB Created: 2021-06-26 08:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 162bf20b6eac3e30543b65e1d77b2106 SHA-1: 19bc6a002dc6f153ffd0ba4485cbea1338c92d0a SHA-256: 72f4e084f1d25f04766c9232aadefea557c876ce16d478fa5a9571277ef0ef18
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 6

  • 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.
  • 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://fred-robin.com/ckfinder/userfiles/files/43526392958.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tp36r6lbogf6kc2p0rhtb797sf/12859067670.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/12795379483.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/jamem.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b82b8d888911d140a3b5b68d923a694d/bavunif.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/14f689b5a40ba842ad15831d139df0f2/17162453349.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f3e4956c00987bfeef92555cf7f1f865/44395944962.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pk05afusd8qvsbj2bii4hhk7s1/291442125.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/dbd885b2712a6f5aaa03efa7d2ea2dbf/34445127702.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fixopon.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/o8rfqjb5pcd4v44s4v7bfhvaci/5186596996.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079b8d87d3a8---kesirepidojafuriwi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e71905ee6597ad770843c4eb08a8a07/92678871558.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c25349b91---45827955753.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210622164806.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/58831366662.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdd6eb03d---41236513983.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c7e7398b22dfc4f797ebacb0eddf2d74/76725173009.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/caa5c0b72b1dec843b2ec54ceb34f0d3/81367045080.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bac3b14c---79642868667.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160871e0c5fd20---niwasezazusalozuwot.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3lcbjp3d824tk45493p6nasrou/11033459979.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/dilejufuwatak.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d6d73f8f3a52676c3f0491daf130fe5f/gebivulirutowojijozasese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=aposematic+coloration+definitionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014959.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14959 17888 bytes
SHA-256: 10b13caf665283229168bc7d833ba3df3c893e6f753133e6548eaa40c26438fb
font_00_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 23684 bytes
SHA-256: 73a1f0eafd66c7c448ff9640db6bdc54eddea500a1eb9d5c12ec11a777e5901a
font_02_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 10760 bytes
SHA-256: 5f816d4f9192792615a9d463b037d5bac1dcfe67e6fb37133aebf91b175dd939
font_04_sfnt_off0001655c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655C 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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