Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19318cb1015e33f…

MALICIOUS

PDF

86.4 KB Created: 2021-08-10 14:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91d005e27d48fec450ffada95a633a2f SHA-1: 5ad5f00a91d7a72dbe63513554fb53f73631535e SHA-256: b19318cb1015e33f6eebfd68db14009cec6b3217fa222c4d735335dc70bc983d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicates maliciousness. The primary attack pattern appears to be a link farm designed to redirect users to further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://dm288.rs/slicice/file/37708933179.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1ne6ag7esd437ii5kiuh567643/25371382198.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f1a3c7b7---tanirijitilurifix.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/oqujip41cnoddonibv9omsjih2/9658546004.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6028ea15---fowaxixix.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/pefatawefege.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/novaragefuvevugatedinow.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/gemuxapalubisumip.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/dexire.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608099934cf84---72964981873.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/fanosanozoduwatewerumonad.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bd4b91ffd76cfba0c3d473f6b5c81c58/zodarukewipikomozexarij.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6109d0845c---zojorog.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/74332107050.pdfIn PDF document text
    • http://schokozentrale.de/idata/88601419716.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a0d7a05a---26469431365.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/womakurejog.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94167395640.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7d5qimkqqs2ibv5lv4n4s8b3eb/72833557605.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/08e9fad72a64b152936ac106089c54a7/1000722454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+ready+answers+level+h+mathPDF 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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 10520 bytes
SHA-256: 7a1e7a0ebb66b705ba0e7e9715b3813e232d94dfaa6213d95649ae9749947927
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 16796 bytes
SHA-256: b532afecf5547a14231c6bc6b7d4d457d3b1b89a8bda71f81bb7a7e348842131
font_02_sfnt_off0001320f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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