Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7000b36496f384…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 10:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e71e350eaaed4d5be3e4bbc28f2ee25 SHA-1: 683feff2f7c705d32bbf0437477b6ed238a4f6ed SHA-256: 3b7000b36496f38492e9b2277f78849ba2d12e8453580fe744c9fe807ee3a2e2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. This suggests the PDF is intended to lure users to malicious websites for phishing or malware delivery.

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 http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/wuromunorenofuturoboto.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g8fl19ckjjgoqs73f1n8b87ekd/mofumavozap.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/10576066730.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210801001756_d1hkj5.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607440d160a87---mupelitiwevo.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kitowax.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/40254488590.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/83f88cs38ipqgobp3q6ai37uvq/73508019897.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/gemavoju.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/77684034735.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/11552121396.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1095d3ad17---gifikigiwutunori.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2f0b94c374a82f8fa9b6a4217863bc10/dotafuvesevepotob.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/77549962338.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c183fb71---87279716714.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084922ab4323---54843624490.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607901d4a002f---48723086707.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/jutisafojepowulizixaseta.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/wufetubapul.pdfIn PDF document text
    • https://icbacademy.com/upload/files/fidajelurof.pdfIn PDF document text
    • https://fultoys.com/userfiles/pomumimulirotafuje.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lei0scvgsrmopg85n542l7ku0e/pukixubinunojolixife.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/vimigegeme.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/423b4ff2f084e5094100461da4d77424/runitoxokirisuvak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=f%C3%BCr+elise+zongora+kotta+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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 22528 bytes
SHA-256: 78be1ac887d287809e0eca4056e09dfbc66d328d89a8f169185b05bff7451444
font_02_sfnt_off00012199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 10992 bytes
SHA-256: bc5132c134133b5cde42bd312bf79ae643776d5c182fb6fcbede63213e282900