Malicious PDF — malware analysis report

Static analysis result for SHA-256 b406d2d8b387e89d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 13:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5befbfd217e96cb46774a53793d7fc4a SHA-1: e93c8f2778d9b023e9232c6573a972c5c9680c49 SHA-256: b406d2d8b387e89dfccb6ea390dc953930f6f3cba87cfeefa2e17bb6f7c659ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of numerous external URIs, including a link farm hosted on compromised WordPress sites and disposable hosting, suggests an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://bielle-srl.com/userfiles/files/muzitit.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091710271234.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/91234642637.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/nutazoginofufevose.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/2692809800.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/30674adf3510b8fc9f5f6efeffab3ed5/tetemusitiborafik.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/dewoluburedologawumiro.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/62433686402.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd74bc8880---83300312570.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/71910777100.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/bemenifed.pdfIn PDF document text
    • http://findacommodity.com/upload/file/99608065106.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/89376600737.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148328e99f03---dipaj.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8ccd67dfd7b5a116270f6ac294c5e2fa/90381247963.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1e8ffb76a65b606a803a7ac977e40054/nileja.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5aa543dc---68995998974.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147b67c1145e---34613334971.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/65728451948.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/14616478540.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/dafimizelabu.pdfIn PDF document text
    • http://uco-kampen.com/media/files/mukapesurefake.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322e890317b---69656886741.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/garonegiz.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/31906936795.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/womesesasisofe.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/modulexawogavagevon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wwe+2k19+psp+iso+downloadPDF 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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 20772 bytes
SHA-256: c763df2f95d1075f2a12b8c480373c5515ecc185f31baec59e8305e84706394b
font_01_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 10696 bytes
SHA-256: 1f572f1a72c2f17b892c82eec52a731d32b0a7950f98d52471260200422c4db2

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