Malicious PDF — malware analysis report

Static analysis result for SHA-256 13eb825bd16a96d1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 04:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fcf1ed0411d5b97768ae2f61cfe914d SHA-1: e7352f43e2fe1a3b0ad50675db6882d3c221b847 SHA-256: 13eb825bd16a96d151d42e1861a9a04a84bfd512b5afa8d1a4eed20cf444c8f2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+character+analysis PDF link annotation
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f9dfa73f3510da6ff62a239de664a019/zifevufugu.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/pugudabuzijorozomam.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2dbbd7826---muvefuvonor.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7efb912d7---wipeponesaw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074167b241e0---42754823882.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c9c4881669dfbf928489f7140db6a891/73696417604.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/najimuzidigiliwuzuponesi.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/japofusojukab.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/28054630797.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dd9f85fdf13fa34d105f4091544ccd66/zufomoluwinewejob.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa6295de6---zomuxopototevorep.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/65722096787.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/25038365421.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/70735547211.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nonuwivovu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a985742e710---4759043189.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b736fbea346---70047612324.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/wifiwamesoporonufatasuwa.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/pebinisiwe.pdfIn PDF document text
    • http://strandedtattoo.net/file/konekedakosenozunugakowi.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/rakagakuzekiziwuverus.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e6b2e9fc7---defoterekuw.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108270535027992.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/39687985003.pdfIn PDF document text
    • 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_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 17036 bytes
SHA-256: 4ea24a8a9c6d1d569c39b621c9e2e21ac2d88b62198ba82954ae5d09a17f326f
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 10752 bytes
SHA-256: 0fac9f657a5cdbee5202b5684a9c539b48a6b19a4cb5ff4db0c6cfe3a5d37527

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