Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb1cad34bdd6966…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 01:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c949566fd7cf9cfc763fe07ab39bc51e SHA-1: 6bc0f16aca8e53f315c2a20dd3ae9e49a186cd67 SHA-256: 2eb1cad34bdd6966e9093a0f671c6deeaa92e86f1061b5551b5b700c495b1753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://goforthegreengolfpools.com/userfiles/file/bebavotu.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614186a976769---vanebik.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/rakezem.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xijovavom.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/95107938798.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b4lvo4m8s85irb8n7kg1niiqaq/jipowadep.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/barabuzogesadit.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/63270417066.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f35760eb---94705146062.pdfIn PDF document text
    • https://latework.cz/soubory/zatekiwekudolefa.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/31967093422.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1239b3ca---27062733110.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/kuzoxitivusutugaw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16704013---66775933965.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/pasodojekijenixe.pdfIn PDF document text
    • http://com123.vn/uploads/file/farokijetok.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/palidamepux.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gawuguxeregaruwevutere.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/89669641143.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/fawazujiwujit.pdfIn PDF document text
    • http://synfarm.com/upload/files/75611045432.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/resubafikulakunelelam.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/19507261314.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/46786288860.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/getiluka.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5021f4b3---11010195725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=top+ram+cleaner+for+androidPDF 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_off0000b53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 10476 bytes
SHA-256: 77cb5c4649b5c01ddbbb5349ff6d211c3a9d7c63d30a9c85a82a6a0b909f740d
font_02_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 15640 bytes
SHA-256: 86493b318e41f76420ffb767848ad6eade5272fb2c9a37d12a29e7589a71b801