Malicious PDF — malware analysis report

Static analysis result for SHA-256 503be9c5851ff4fa…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 10:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20b5370362b947651c6b32b94ba41d54 SHA-1: 19513b4cc0fdfb6cf00b4e1b3af7f1180701e88d SHA-256: 503be9c5851ff4fabda9c568f3fa90430bfa84a2cc28e87785fa4b7b3b9e737e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external sites, some hosted on compromised CMS platforms. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=mafia+tamil+movie+download+isaimini PDF link annotation
    • https://smilaxlabs.com/userfiles/files/fivolakajovevaradeg.pdfIn PDF document text
    • http://355353.ru/userfiles/file/nuxew.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/53549489931.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/bolotikupaf.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385707f0c7e---81891491161.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wepexevuda.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/bizexajefapasabobatevum.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/doxabaxodenifizolijorodu.pdfIn PDF document text
    • https://preciseenergygroup.com/media/dosiwupemofepupopanalul.pdfIn PDF document text
    • http://it-hair.com/userfiles/nagamelepupigefilivedi.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/dobajiwunesuritado.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d10e9d4a---41624763411.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/672525726.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a15859b6c---tibanitojavelogagomov.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/7751535536.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/414a316523ea0fa401fc4630a5dbbe5b/47802319659.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b4cb77fd---55518559012.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/numubopidagedaxuruvuver.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/liwomafejikubud.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/36501676129.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/remikix.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/87139798697.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/pubexine.pdfIn PDF document text
    • https://nada70.org/userfiles/file/40984743284.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c73749c0b---gugogafu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/16951378008.pdfIn PDF document text
    • http://ausafe.net/images/art/files/3726925217.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/lixigerevitoxakam.pdfIn PDF document text
    • 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 17372 bytes
SHA-256: 80dd891e07996565bd1c99e3ce5ca47f92d2c2c58c45ef082a05177edbe61948
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 10560 bytes
SHA-256: 8b8b9142deb8b13dd24731e6e4601c0a3d3c26132f5e20c2ac6f6dea8f928d4c