Malicious PDF — malware analysis report

Static analysis result for SHA-256 b190ab2918846233…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 05:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fdec29f719904ae44f5cd0251714b4e SHA-1: b3d4242d088e28072e6b1a5aeb1059f4a3091ec3 SHA-256: b190ab2918846233900b036f4e9873f9c7f2f39fbe865545b30e221cdaba5630
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious content through seemingly legitimate but compromised or low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bustotoronto.com/userfiles/file/wasagaxikujezovifoju.pdf In PDF document text
    • http://grotech.in/userfiles/file/xubarubabopewegivog.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf4ddc619---vimevanonujadazewipuma.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f16f2b7e---59389896201.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0270f43959.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/fagajesikujifibinaxovuw.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16089c972e12b1---21103659524.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f163f9a5bc---89244746796.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/42740259969.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gifitonomomevoberutanu.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/jatawebuxodudamakavukovus.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/4689124832.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/54959870401.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/totixafasoxexasi.pdfIn PDF document text
    • https://2acontractor.it/images/file/jobejira.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/vupeziravufemapiwasimeliv.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/42432483344.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/xuzopeka.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/89046250921.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/75889870755.pdfIn PDF document text
    • http://goref.ru/files/file/xijofowo.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/88406957433.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/53338044805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=textbooks+online+pdf+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_off0000c603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 16248 bytes
SHA-256: 096dbd43bcf20fbd3bb01db0860e0e0e3a84cffcee018bce452a1dc012f57ffc
font_02_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 10776 bytes
SHA-256: 44e0acd81171ff17c19a31769403bcccf940551e5221ce141af6ed5a21c0919e

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