Malicious PDF — malware analysis report

Static analysis result for SHA-256 7677b60002ba475f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 21:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 995e3ba5cf1fbea20ea03118f175f0d1 SHA-1: 16e3aa63460d8b67f8af2a3bdaae5c852e58234d SHA-256: 7677b60002ba475fb2878a8e161ab004dd84917559597fd223bc7969214fde17
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://austdoorcaocap.com/upload/files/16374266012.pdf In PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fkfm1kcd0p9okibltm9sj80gk0/wifufunetuxanekuge.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/gufolilixiwimunufu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/feteremafepimexi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8a7d9754945e4bc7307fe435a6c72d8f/38993835320.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/69483283265.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/ninowomikuvedife.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/fusobukugusigatufovuxisaj.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcc70d3d66---87846495706.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fuzeridajuf.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/62674186507.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vokexubuj.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e93b3386---wowob.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/nolavasofixupaxivazoxus.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/xasuputisafuneradebat.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d917932f514---nejekevifedekidiv.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f5607ffef0d418f55afc9a4bb7116cf5/mupipevorafevoben.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/56084578094.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/pabibasebonozemod.pdfIn PDF document text
    • http://acelybio.com/upload/files/mazadakupowoditawekipekon.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d07jbr56ej46hb086491aoskd1/jirifasiw.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/jigokaz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4375a0f280---88079202390.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/sodularidudowezanax.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/96586686946.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/83857789855.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/7439095446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=agroforestry+model+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_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 16692 bytes
SHA-256: 265b6b0df05eb3bbeb4bc3f72df5c5215d199afc158e17befe892b7318e20758
font_02_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 10576 bytes
SHA-256: 8350a9f3c87662c6abbb62978ae72c32a8d1ad9ed25f8d5962d0ed763bce53e1