Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af0f502a12d7e30…

MALICIOUS

PDF

74.7 KB Created: 2021-08-07 17:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f15d7ba32c71eba62d4b01c719d36ac SHA-1: faa5b1c5e6959ba799984fd74d13069d8e7dcdc8 SHA-256: 5af0f502a12d7e30784071461b3960e07a94c21c337269526eeaa0add5eb91c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://argumentua.com/i/file/23074741092.pdf In PDF document text
    • https://embassyinvietnam.com/webroot/img/files/towopixojivijibutojijaju.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/domajemadapozi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e8834c49eebf511ff9f7ae63e5906ee1/zowaxadiz.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/jeduluwolifemap.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/dikazusura.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/4023553401.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1b7c8cfe4daf630b70168b9d4ced61aa/41253454511.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/532c411840569e10a91bddcbb241e52d/bekapuxar.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/17984194500.pdfIn PDF document text
    • http://teraval.cz/res/file/mirufogofefapuponakil.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/86134733795.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/27287416392.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/dfe8a96063d0f5055e1adcb677705c69/derisilexom.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/mopaminasefu.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/fojur.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755be4ba65d---22573809841.pdfIn PDF document text
    • https://tempegaring.com/contents//files/kupapoduporovatem.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/60822655507.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/obdkdj51qms6ot7hm31g30rugk/81913451245.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/kegozenerumadufexaranap.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/perorubanegovut.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210730000607.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/80762828642.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/sidaloxesutujizojomupuz.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fe149a5dea24bff720ad2029bfd5db29/revamezutababugevufa.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4386bc3f1---73204136322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=descargar+spotify+premium+apk+2018+para+pc+2020PDF 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_off0000bec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC6 15932 bytes
SHA-256: f7a4372c374fca32c96d53ef42ab283999d036dfb837d46291148b9c13552c0c
font_01_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 11484 bytes
SHA-256: 780bdd7df6f9ea6c76058cc667931b596202051deeade10bc8c438151a103fb2
font_02_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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