Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1757a2c616b559…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 10:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96ec307a0d3cbd616b762d36922c7cd1 SHA-1: 6a6db4fa3a8914f4820fa5e087033f6678f87047 SHA-256: ee1757a2c616b5593cb2184ee7a51917ffecb0bfd57fb187d72f53ab8027a147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or to serve further malware. No scripts were extracted, but the structure suggests a malicious document intended to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3377u24lsv0ftd1r6mfrup0cfq/lalofanalenekedazezipug.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3e687fb2---61180957686.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/mafiribekoxi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9718ba7ce---fonujugodowumexamomow.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/70219207053.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/selinedubuputud.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/49049442189.pdfIn PDF document text
    • https://equinox-e.com/upload/files/newedelaxixumuw.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/dafojaxolabadofugewo.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/jefad.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f79d746de0fc9670c230a878e9a05549/74486483274.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829bbeab367---61209042910.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3421ab3942---zifiwexijetajazusejugenop.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/rejekoperebimewab.pdfIn PDF document text
    • http://markone-tools.com/upload/files/javonategixafogig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4ce708e7---28761770876.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16115e4e5de4d7---22251598241.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/nuvijaguje.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/741e3ff5f0e0caf1bfd40e16436af75d/14770453063.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/364708396e8025a46fe90bc7ede97c0a/37370093098.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/af894daecb1350f840a02e62c306ea48/13397800783.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946435aa23e---20023867431.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/61835330101.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6b130dbdddbca6e275cfcd6a692d1204/fifuzivazepezeletofulufa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b59675c2702---42613520911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+short+history+of+the+world+geoffrey+blainey+free+pdfPDF 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 17624 bytes
SHA-256: 67aeb14b5cd1cbb9dac8b6e632d3c44d89189751fdf4afd0844543191abcae38
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 11100 bytes
SHA-256: ff1729fe8d707b723c94417ca98eeb85b765598b7136033e134fbd18c0e38795

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