Malicious PDF — malware analysis report

Static analysis result for SHA-256 5451a7a9f3dd6ba1…

MALICIOUS

PDF

90.0 KB Created: 2021-09-06 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b8f34c628d5cbed1770c46d66bd1315 SHA-1: 987b5d8492deff6013e4b35fc8d5c08d81dbf7e1 SHA-256: 5451a7a9f3dd6ba17de77fdfccdbe91eb9272306302593d2e60bb958ab28da2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://digemnd.com/UserFiles/file/19990081304.pdf In PDF document text
    • https://dadesigning.com/daduserfiles/files/74047633343.pdfIn PDF document text
    • http://entrackintl.com/uploads/vuwaririsozel.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160efe842c03d3---65653810769.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/3673091567.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t1no1opf45dvgr6kqfqb9rcpn6/43129284859.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/puxutikokosalewolowuke.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/jojunam.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7c4b9a62---wogodilo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0d8cf0436fa64d614f0081cec241dab4/bofitekekurimoseranubema.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/rchrbf7decuqe6drngpnjqhmfi/43455714767.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a0e32caf---84323943366.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac69cf1e2---kizelipi.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/aed427db9bab4ab4cfdc9323249340a6/98624220815.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/xupona.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099b734e60a6---larizat.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/ninumugotaxukexasex.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/977cd91df906f05a4b0215c2daa07064/juwafigi.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/9738682234.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01ab62707---20176146570.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/guxefesusobijogavibilor.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/13591059024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jolly+phonics+books+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013c30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C30 18776 bytes
SHA-256: b5c999f83d92bf1f32ecaee8a7519f9f77f46ffd654abd116a2c4bbaa8fdac81
font_00_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 20340 bytes
SHA-256: 0ec5333e98ee28264ef6e0eefffe668479e0d2eb9c115047da38429953e25e93
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 10564 bytes
SHA-256: 13c611dc787d9ccb4c6798544e2bb84b1e7dd033322564697a141d99908d0936

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