Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc90f26723c8e1d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 14:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3019d8b73f996713e519196868a7c55b SHA-1: b01580281580b8d977ce85b4d9a9c040b3b6adfd SHA-256: fdc90f26723c8e1d2c863182189f806fbf048615402ff2da96b259d4d29570e0
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The file's structure suggests it functions as a link farm, likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807409b927d---sijamoxamojalen.pdf In PDF document text
    • http://softwarefactory.nl/images/file/sebekirodifupiridigavafo.pdfIn PDF document text
    • http://babamoleskine.com/files/file/jefovotukawu.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bamulit.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/didamasonutiv.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9720de7c6---62637850295.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/95916378060.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f436b00d02---tilinugugopapiwujopuxebo.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/vubununemoregasu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608873e72fc24---98630711742.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/23200845947.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210618013133452.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c679d212515---tesigoxusonaxiweroleluxev.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tfmgpc7er62vigj7d1c2dc8ls4/xasibutanited.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd49da3b6---vevom.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/62983639061.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/razibigizazuvalabidal.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae281ee2baa---woratimaseba.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/53660254868.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pas2bpn35uik8llfqsbc8uceii/2785255848.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01ae255e6---fuxirib.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/88438160075.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/90680482590.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/af2146639bd0e110c9d1e0878c8b6b31/94386728294.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/5225255223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=importancia+de+las+reacciones+quimicas+en+la+vida+cotidiana+pdfPDF 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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 18828 bytes
SHA-256: 3978a47a093ff9399326f637dfcf09b9b83e38a9215eb0df81d1dda58e41560f
font_01_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 11044 bytes
SHA-256: ae3cbffa2e21d3cf6aa5a8bc6b360596b61f22fd9ab27d029240dc739ba4dc89
font_02_sfnt_off00012750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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