Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd53919d252f803…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 12:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 314643cffb2413f9ec139711141149cc SHA-1: 5ed1b8a9c6caaf61bad1d61e952acf104aa80887 SHA-256: cbd53919d252f8031475f3d4b3e409b81d474cea6788da4860b2a38278053094
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99890114484.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eadb1f847---79824706888.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6077c17618b12be77d73cfb93aaa9f19/wojas.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/71043588230.pdfIn PDF document text
    • https://eslms.com/userfiles/file/fogewunafe.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/1001925106.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160781b6a10608---bojekuzodaz.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/28944992396.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8640a26c5608bdccf50ff59dea567878/51165350911.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/3447955770.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/e4v3kki1btte6cp7mvfv2r2kqp/82515509999.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2b42189b04734cd21318055c13869d63/91625602446.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160772a3822827---58210601563.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/sutofomalepu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/u8f5vg5p020kei6naii25mdurl/54707798748.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/859cd74f0163074d471cb648b3a21921/selalufemixarus.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ac7b8875b3d377fa94fd5780eebdacac/83249043659.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/runujozosoruse.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/50176159810.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5lhhs014t5ppcrre83sngil5bi/juboninadosixedugevu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076771101365---65383770001.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b348b5d35e---56351607621.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72f207fbc---jitogorogobolamak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=importance+of+auditor+independencePDF 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_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16676 bytes
SHA-256: 20ce730b9d275aeaf014c4e2203479f4da82ab01c7ec4c5065c6fb289b02f57b
font_01_sfnt_off00012c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 10620 bytes
SHA-256: 723e38795e598aa8dbd3d5baf233a24eccfb251ba8c55afdf36d0e0926a4eded
font_02_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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