Malicious PDF — malware analysis report

Static analysis result for SHA-256 2234f048e7b9abed…

MALICIOUS

PDF

84.2 KB Created: 2021-08-29 15:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6b738931c4db4feecb000be6901601e6 SHA-1: fef14c54923d482bbe496d646045537fbc14b144 SHA-256: 2234f048e7b9abed8b0ad804d2065a0fb71c75dd731988d00a7c47d3886beede
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://classtool.info/upload/files/xibasugijulisud.pdf In PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/60032638105.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/pojute.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/27566ae0a97d40945642429caa6f417c/wawutemamasew.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd0f0b08c---koxitisezoxazar.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/91834968981.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d19a4b668---xedanozirulafusozezija.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee9c69aba---46328845218.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/ginazumik.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/79770136349.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/xedepuvowimugelapozakofu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tosinivusomuvatufurobi.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/sifidagofovofizoza.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc1d09c1b---xenomiveguzefi.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/52903288903.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/63988193366.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076598e2fc92---75372855146.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d180dbf8f3---bawadapusekeminiterepi.pdfIn PDF document text
    • https://atl-50.com/files/file/mifigoni.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c81248b1a---9325420404.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9867174245---piramodus.pdfIn PDF document text
    • http://anupbolivia.com/images/files/35585587512.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/97488703050.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/gutaboson.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f0d4c399---19234591377.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rgtiqa8tr46r9e38vilc6enuo3/42671402897.pdfIn PDF document text
    • http://firegallery.ru/img/upload/82510563709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=examples+of+emotional+barriers+to+communicationPDF 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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 17236 bytes
SHA-256: 75c01c74dbac78b205fce82f571b5d2f93fac2bf05fdc761699761eab4417d3f
font_02_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 10964 bytes
SHA-256: fb5ee8fdda1c0e459930bd683ee43a7313804f5375ec63a027560e08fa96b7a9