Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b24d8cd8c51664d…

MALICIOUS

PDF

84.1 KB Created: 2021-08-17 23:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ace03fdec4333dd937933c094c18d656 SHA-1: 4459d3d3b63298cc0d49eaded3f49fcf602ddfbf SHA-256: 8b24d8cd8c51664da4477493b6f6e48074e3398c6f512b7c42aa28fd6908747f
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of many external URIs and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://eurekaelearning.com/upload/news/file/bajubovoluxete.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f5af38b678eef9a2c2bbb44571206622/98887074457.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160df111e5cb9d---segivefewof.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4e3daf593aa29a87cad67d65c271d28a/notabi.pdf
    • https://amblamy.ee/upload/file/vowabidudoxazasegakonoxod.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/31b30df32f2a0946d71906c99e0adb49/xonefolajir.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01fc039e1---51054988825.pdf
    • https://oklogistic.lv/upload/file/wugutudu.pdf
    • http://alarmy-kamery24.pl/userfiles/file/pumodudafuwewulosijetanej.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/07smfdc4rangerl09it98nan3c/41105370298.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bfuonjaq38jq9j2h9vlgl9ftet/10778545434.pdf
    • http://darec.sk/files/files/90229231507.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bfcd9bed---nepemajuvomidi.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610616789bc19---13478474624.pdf
    • http://hasyo.net/files/file/jurevurakawap.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5d7a0c8a---26718138391.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/85c3c9c2d3ae9db45dfb54b8681d4010/kupagevi.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7d90591333fd485a5a62ccf7d7ab8191/rawilalexelibisup.pdf
    • http://bighost.vn/uploads/userfiles/file/95232116910.pdf
    • http://designfromall.it/userfiles/file/922477301.pdf
    • http://www.dilipprabhavalkar.com/images/file/53944230354.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fab7d0a1697---3591259822.pdf
    • http://alrabbancapital.com/file/files/48667683675.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=1+hectare+de+terra+equivale+a+quantos+metros+quadrados
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e165.bin
a6d7272d672bf03648cebddf45f0adb35f8961f582611a89ba42e5eaafaeb5f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 19376 bytes
font_01_sfnt_off000111eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 16792 bytes
font_02_sfnt_off00012a02.bin
20135ff9ca6821618c552f03416d04b569bc41c76ab8a1fc2e7df04568a43e69
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 10900 bytes