Malicious PDF — malware analysis report

Static analysis result for SHA-256 07477e1639602c67…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 17:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bb3d6c32908e507a87a2302d516bdf87 SHA-1: a2bbc6f5b885f15f63f6bc3961eb936a36fa9873 SHA-256: 07477e1639602c678d98007a5430634e8bc6f1a96072220699396a5ca96c5af1
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fc990d1d15bf2cf860b18d648b5bfe24/59857330902.pdf In PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/37068269351.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/gufotenumexovitafa.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/63245663371.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/60815506659.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ef8e01d5c6088c0921d0ba31ad4de513/viteloburatajigub.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/5259017397.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b858175f8c3---57805687373.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/99016033852.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/widilelupozirivakumok.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/gefalolasu.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/soxapajupaninajev.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5463cb2e8e---1456793852.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/862bd11e3e2d01815886036845e7abff/72189913323.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/79573875336.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/lufinuwigi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/58768596768.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/vamupifovanedugelefejex.pdfIn PDF document text
    • http://darec.sk/files/files/76596063980.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b02ef93125f---mokemor.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/47270298457.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/6cd2c5d7293640608811bafbab00ada4/fezerinojimom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=class+10+english+text+book+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 17984 bytes
SHA-256: 8a7c04a8676af6375c5a00c4a45d1c146c1b0f26d626a09d84b7406ed009e352
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 11216 bytes
SHA-256: 65a43cf6f41b128c1c1317eeea23c78c95489dc29df31b8cc17fc99aeb530ece

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