Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef34649636c5378…

MALICIOUS

PDF

88.2 KB Created: 2021-08-25 08:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec19cac703ccd8d1541d86011b84dbd8 SHA-1: 570b1bb99342c87ca05826865a191a47df30a995 SHA-256: 4ef34649636c53789895f3da465ab6845b4c02f1fbba9b7dc41ace1b7814e11a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://beamstraffic.ae/amb/userfiles/file/3584911483.pdf In PDF document text
    • http://ogledalata.bg/uploads/pages/files/wamonuzomoxuzajo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/67364360499.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/40445370467.pdfIn PDF document text
    • https://t2sc.me/userfiles/17530798603.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748d919b18c---voxixibapixeju.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/18p7euoeiq5muqehc4m1rlinfr/lakejoxab.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/4732538861.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/fanizimegax.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/84261850495.pdfIn PDF document text
    • http://lucann.com/Upload/file/794149026.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/foxeja.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/77602458243.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/muzepomun.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210821213048.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1be581473ba9ae6b98f416fa944d8f1d/gejuvojo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945755f04cb---wojapawanevixesusof.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/foveve.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/rebubafudulusidexi.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fifimezorop.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/vudigimewi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nr40hlusegqmh8o4a9q5hl6dt3/gawusizenetaxodiju.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceda16705---77593864436.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/kuvisivonajax.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/40528423085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cbse+previous+year+class+10+question+paperPDF 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_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16568 bytes
SHA-256: 30b304eeae63b930f467fb2955ece773662940bda7579fd47467480ef0762556
font_01_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 11136 bytes
SHA-256: 6fc6b10cab99dba283c849da620cf27d26129787de8640db0c5817ca11b96d83
font_02_sfnt_off000139ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1