Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b386355864a6940…

MALICIOUS

PDF

92.6 KB Created: 2021-08-07 09:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 35b7ccde0b490c48d908f704aef83910 SHA-1: a152df94a70324c7b64086b6096b755a3dfb3820 SHA-256: 8b386355864a6940d63498c841dc55ea1fa69990e6b3e2f7201faf550db101cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • 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 http://ehomeforeclosure.org/images/file/wugexorawemu.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0069feea---pijuvatanumulivufikijilev.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f6207ba237f9c8259b94f11d5c7751f9/21834147136.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/477d426b03655b6a4e275698d9fe52c0/20999411430.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/gusozetonulofu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d51b1c497---95781976849.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021063022501342.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29b021eaa7---pidemalelukelivogata.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ea068480f---54189728065.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261b12bc21---medagoladi.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/29663292174.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/dufobasivuwuvasatu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9349b5c99e27ca30192199be85e2b27d/buxepuvibumedow.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/wikepux.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/32708195780.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5b71d70e---wikaja.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/nofimojapebivixibowodera.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/56089884867.pdfIn PDF document text
    • http://arablift.net/userfiles/file/90011123607.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/merimusituxepi.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rusujegotid.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5db62db618ef0ca0a98c34503713a6f8/66844144404.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99a6464cf4---44373533188.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/42234059469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=indian+movies+hd+fullPDF 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_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 10540 bytes
SHA-256: 64f5f35726879b2ab8099317320e92f90143c49b858426da91d6ce4a810ab8ff
font_02_sfnt_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 17336 bytes
SHA-256: 5c2c162547c1bb184761c935b56bbcc7aa93d39223541c75443c0887e717e626

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