Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9da393a1c49bfbf…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 06:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba225359690a2f5e768a5294f51aa391 SHA-1: 8a8f85c4376495220079876688201ccbc4c15ddc SHA-256: d9da393a1c49bfbf8e01d349b1d251c29f5939f0f66bf64b87e253c726a86c89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pass38.com/images/contentimages/files/palukovimedisezirabutov.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0ed61b7282e137b1563470169a5a9fcb/50578691383.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792e59276a3---27575907716.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/15070942401.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/l18lpcpq208qn08ig4cc0o4406/48952615783.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/tinituzamevujumaxoler.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f529643ac5e68fd295bcc746cd1d7494/46637217576.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/46087381383.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/79446392655.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c76cd647a496dd14d79a23010d9b45f2/57277912018.pdfIn PDF document text
    • http://aurora-c.jp/files/files/piliwulupijogepisokelubup.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b036f549157---94497326023.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/difajogukovape.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b90f7fa28---64466323500.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/joreza.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/abc58715f58c43f2b40ca848b9eb2f92/45301233166.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/71187801952.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/lebuketizekasozax.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608017ed1238d---40863421045.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/64684109703.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/32867399896.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovnivrq44ju2p2omm305mf3une/36254557073.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/84420395698.pdfIn PDF document text
    • http://stevis.cz/files/file/3361010696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mini+cavapoo+puppies+near+mePDF link annotation
    • https://mediaget.com/userfiles/files/63538550522.pdfIn PDF document text
    • 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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10548 bytes
SHA-256: a720bff18caa1b5af913c8e03e5ac387bd79dc4dbbd21a07216a59db9295d9f0
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 17448 bytes
SHA-256: e0b1c44b1a78d29c13022ee0d1bc3ec00053d99a0979446f941ee042aa861ed8

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