Malicious PDF — malware analysis report

Static analysis result for SHA-256 939a2409792e1cd1…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 11:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b4e3eafc9dabc321814e1e66a68ff18 SHA-1: f247152118cb4837d465269f17c589729ab87a14 SHA-256: 939a2409792e1cd10ce971345dc28358ee34221160b3f3c954ec5ca599ac3316
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised websites, suggesting it is part of a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure of downloading a payload. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f7c49613e2e888e989d3761cf20b7e14/91063737937.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cac51e3f2---sizonan.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3a90feb7c44003419d113fed6f54c9ee/sinemajunez.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/88f49b4ea08050c663cab4d06c703e7e/siroligufumo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//wedixozulux.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/xikazosixodiluf.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pujimanelinolujadi.pdfIn PDF document text
    • https://plasy.com/uploads/file/katug.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a7650f3b---jazelilelisakumixenobepi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6298c4936---ruvojinanebaje.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107040939242918.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/kisajiwo.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/53937009326.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c6017a3d5---49574769626.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/bukojipavolu.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/59397834978.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ca6a08c0b2b88898a3dd46a0c6f2003d/koboribidijowogojafogen.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ad0040f92---29877319976.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/guzadediwa.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/4aa5bacb9e2a691c60a244adbe347688/16125603858.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/gasam.pdfIn PDF document text
    • http://altinay-law.com/images/file/bopeteta.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608082f7c8fbd---powuzotazinu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ced2d59376bec14d229cb643d03be590/zakutexamovu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kebaruvurifinezidatomevis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=candy+crush+soda+mod+apk+with+facebook+connectPDF 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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 16848 bytes
SHA-256: 04d20c60512f247c940cff22efd883e8c8fcc5b9a7c6a3c71a057ea9b3487826
font_01_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 11404 bytes
SHA-256: 90727820b95abce8b932da4e1843523054b5d2a91075b74f5fe710ecdf179146

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