Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d8bda6c432e37c…

MALICIOUS

PDF

84.5 KB Created: 2021-07-17 08:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ba7b4d106fa3f04dfbfb216adb9d817 SHA-1: cf1e2f31e27aff3c40caee1bc9daf92a21a9cd23 SHA-256: 19d8bda6c432e37cfe7d84d051fe4d1645f9719aaa27beeaab15b6ff0a110eda
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076d29b5d4c2---87194448212.pdf
    • http://teplospectr.ru/images/files/60688119724.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/93f1050b9d3353b3d01b63f9896a8a6a/32156897655.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c99321f1b6c3d758a2e46de3ea142091/safegesaxekaxometedikolaf.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4da87b752d43863b14d5b7540f484c91/pazubinumovikovepefabine.pdf
    • http://formpart.com/upload/ckfinder/files/vubemixaxapa.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdf
    • http://inlygiaylynhua.com/upload/files/zesigepalakiwazepojemogev.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/82237353357.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/85336470441.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608931543cfdd---99808307459.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c191002e6d9792d15003555fd22534fc/73046987395.pdf
    • http://www.leasebridge.com/CKUPimg/files/fezotivejoso.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/34471483356.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pojulal.pdf
    • http://derkwoo.com/upload/editor/files/ketov.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/506b0ba43ffa956722b0ec52bf487435/mujuliziwimimevarefi.pdf
    • http://moreit.ch/productinfo/file/regifuwumebiloradolum.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f69537103---49106588176.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c61c2fe00---lusekuzek.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/wifozagifomiruvojo.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/aee150a0263ec409dc70ed3f14075409/89584725377.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64483a94d---vifulemafamakaza.pdf
    • http://goodtraefarm.com/ckupload/files/tukozolegojokojafefi.pdf
    • http://ketoanaca.com/uploads/image/files/jipematad.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e480c77702---sedinovimawuxupowisuvux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=marigolds+and+dogs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
font_01_sfnt_off00010277.bin
642e38dfe7609beb3114e1a17a9f2290138fb465d0980b7ae5d0671102f3bb2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10188 bytes
font_02_sfnt_off00011911.bin
980b41020a94b4b5be94c9f5151ba44418b809ef5de35a79ae0beafc024b7f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 16788 bytes