Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6e4d09271ed78…

MALICIOUS

PDF

90.6 KB Created: 2021-07-19 06:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3defd55d9b81fb3a39c635661c70d452 SHA-1: 5b95aa632aa842251aaf6135d40432a3ecf629f9 SHA-256: 3fc6e4d09271ed78713ebe1d52ab1de448deddc06c2efc888dd2728e853a1b16
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ea01a0aa---18487924037.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/rasexafow.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc187cad68---naraso.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626a561ef3---kuwalojalusew.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d78776ce---43125155014.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/3691373494.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mb7ri0asabbhkk2ndnuihio6i9/zibigobevarokivalimepiwo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6b84bef85db50ad06ee42a447803ea7c/fuvozarazafe.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea3ef3f3f902d0ade942bf5fc43f7db7/dizimofiruwi.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/vuzipowugonevefagisufate.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab8f8b597---62706404439.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/vuvifezitekogalo.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/40581087340.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee83a7d377f---gitefofadasevurev.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0pfm6vb13i6q5o5ckmvne9s916/32958528074.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/99198402608.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e696ec389---92716968602.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf06d57b1c2---84779441757.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082001a0a254---56634030236.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cd00bfc0---pusidipuvawor.pdfIn PDF document text
    • http://camonetinternational.com/files/file/73245554593.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8e30525c1e69f8eff4de473029bd5138/borogowalorova.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pelaweraxajotopezix.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5edc35d56---rudisir.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/33157769845.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e005bc27d2ea5fb4d7b030297fe13cb9/bajedoz.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/66283271676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+short+happy+life+of+francis+macomber+analysisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10960 bytes
SHA-256: 625eac058e0ceb565a303902757cbd3d6fff79653881eaf6a02b34d77677fb5a
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 16108 bytes
SHA-256: a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b
font_03_sfnt_off000130d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 16612 bytes
SHA-256: 399c4f6a6b494b2b4deea7e1858363d96aa6d3dff9df8e65f2e12ba0515e763c

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