Malicious PDF — malware analysis report

Static analysis result for SHA-256 538893b8a9b27d98…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 17:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc71c4c1e876457c5b88d14246ee21ee SHA-1: 6fd342be8de78043781d6557d161d81add92929f SHA-256: 538893b8a9b27d989d8d20e473e5f470c1a05c99cb05ec7ae7fed733672e3c70
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607171d03b7fa---14725209525.pdf In PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/56167cbde18d1c98c74b1704ea9b9f1c/78638104284.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/52446024549.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/55444604406.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/romajosirijusakebu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/92544709471.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/4935407147.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/kamanukoxonogeferibodivo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8f769a88---xumijon.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/23562436359.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/duzasutazejogafel.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3e6fc1683---pafalesu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/17344993187.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/fanidovugadobigevodumuj.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2e3062908a06db0814b25b479ccf9e13/69477518510.pdfIn PDF document text
    • http://alkanboya.com/files/file///ludikakexakisokeni.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/69cc79ee146f6cbb0c10464a976868f5/21946652400.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/pavusu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/18690471404.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7d134b14---wadepepuvu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/39e4dd6ab17b6e26e7f439c3d7da0999/godidewuboraraxotaw.pdfIn PDF document text
    • https://actorconseil.com/files/file/gureduvisebixofebosuxewu.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210629063843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+adweek+copywriting+handbook+pdf+free+downloadPDF 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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 19764 bytes
SHA-256: 080ccf670a9fb794ba52f75eb89c2ca51e8b418926d422039a61a72b64509702
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 11124 bytes
SHA-256: 8c5ebf39041cbff7bf986a43e546873128f86f936d412d6e58f56b5767aa0d6c
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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