Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a24a02e1c08965…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 20:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45466b515d0c54dfd745c11ef0d12d3c SHA-1: 5cc41134874583c391a7fb456129712c7c2d824d SHA-256: 14a24a02e1c08965893eeb885c6398f8bc581cc8a235bf6a23239ddfa5ef297b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially malicious, sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607793741bb2b---xuzikum.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612c29f7d9347---45711542825.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gizekuwepivanubujapam.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d2268130---87978139956.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0fabf7f950805214e722c806674e675a/27513366198.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb969a52a---linipo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/82078664811.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/tikifibumi.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e44911b8d81fa56a25943c3812f8b0da/vajuzafozekawod.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c932631c---zamusuxog.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886bfb9466f---fagirezofukuxupevuxogoki.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b6ceffa9e2463ee8ddac9b980e22dba8/nudalodebajuzunef.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075791d056---61734072068.pdfIn PDF document text
    • http://elitvorota.ru/f/file/mokemu.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/kebuputasorubazavaxibuf.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/siruz.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/dumiwekigonizij.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bnl7buaqvh0qkjc4mrggoh5k94/tanitimukud.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/55100406774.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/79588879806.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/fonitigexefoj.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d770767e---dizikexopalovagokobaz.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/75393262102.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18f774a26---gesikanufegap.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/pudaxogojasel.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/60173003173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=calendario+rusia+2018+pdf+chilePDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 20820 bytes
SHA-256: 8199698d472dbbd2e998f25f7d6830d8872b243f74f3844f67a92463a8903110
font_01_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 11252 bytes
SHA-256: e0add187468bcfdb1a0765a803e6fb6dec930df885c2f3d6c6993c8f12df58e6