Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fe237d4d312747…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 13:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e6b937e79c792ae854e45468b93891c SHA-1: 35c89cd320295fb108cea20ebfd03df3e67cb45f SHA-256: 90fe237d4d3127474e32e4b58705ac41c654fb4d5b0d22f112a63145c01d9b03
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. One URL specifically mimics a search result for a popular book, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://axi-hohenstein.de/userfiles/file/47854271540.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/55014492741.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3816db8588fd1947058d4e331932c153/49470780092.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/51792309437.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/dujogepazogafunobizow.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xoregenolafa.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gixona.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/jipetenopub.pdfIn PDF document text
    • http://nprofit.hk/userfiles/kuguwagomekesusix.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/8135801235.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/bimulix.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_25C49E479995245C.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd20ad3a15---xixubujonatitawu.pdfIn PDF document text
    • https://fuoriscena.eu/file/dobopuj.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcbfb4501---54399372870.pdfIn PDF document text
    • https://vestol.bg/files/file/dolesulubabomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=harry+potter+book+6+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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 18788 bytes
SHA-256: 69d63d9947461c3338b558f6df6165f905d9d041071e02eeafbf5ed32640ad24
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 10824 bytes
SHA-256: 82df9f1d3a187b8bc4c377e5ba73ca50129bbdd8f4c29fefadc14ec180ddb8bb

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