Malicious PDF — malware analysis report

Static analysis result for SHA-256 1629749239911f1c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 03:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d28af9f8cf5d9a9579dfa0dbd43d74be SHA-1: ef319bf8b3061fc2ffe78e3b7cdad33a851eef1b SHA-256: 1629749239911f1c3a873ca3f86b4e95ebec919ec3814fcae2e187807a375d21
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://lacaune.hu/userfiles/file/81466825354.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16fed12647---xugalemitimadegelonob.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb594ba10c---44406265903.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/fedowimujigifakovoba.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/34772328659.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/bevawivunimusika.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160878f049d202---83839937927.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/77614153314.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/41111008240.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/78987579970.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/jetipotewezawamunifimu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead7827623---tiwapo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021080205535780554.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb327f5db---ruripokukef.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/93575759685.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/11275663587.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1135e829---miwisasuxisoziros.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/kilalesamapogopazuve.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/lumulu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/86571654475.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/vasodugorub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=public+services+worksheetsPDF 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_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 10544 bytes
SHA-256: a3af4952142b32204f3d78f4eda4da423e24590e1bcba8c275eb32626c03d0e2
font_01_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 17716 bytes
SHA-256: dfb9aaf9a23cf49d62639fee9da3231a04cf4e84c2bdd104387d5c862da97538
font_02_sfnt_off000115b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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