Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a59a0adaaea65e…

MALICIOUS

PDF

103.3 KB Created: 2021-06-28 04:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81c457a2a02d132c8fe291bf5cae02b9 SHA-1: 192388f81af799866a15784bebd535d13eb8700d SHA-256: a1a59a0adaaea65e940cbc270b1723bb985bb2e91aea63c0790599da98fe6f4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://queure.ru/uplcv?utm_term=malaria+pv+positive+means
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fdce732f---22541694648.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa91cf013---38313679713.pdf
    • http://55thocscompany.com/clients/62662/File/kujipo.pdf
    • http://dragonera.cn/admin/userfiles/file/biranozifilinibubaguxumo.pdf
    • http://jnnycc.org/userfiles/file/82880666565.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc97b4efb---28824522823.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b38a76a1856df1a165018abbdb960186/woxilaxagudabewul.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c953231c9a---fajamivufugoxopuso.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ada2169d1dc7ebc809e41230a72ca80f/gokuselemikokopawa.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/66477f520070b3dfbacb7fb5ab5b4459/miziginesobugox.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d189ced496---57977982082.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e68b83e6d---mosonusidukoxodiki.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/06f4b295c2e94cabbd3c042dd6af9c09/19948374048.pdf
    • https://campermagazine.tv/public/file/70815724438.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/370b7af1fff232326bdabe95c0c7e13f/gokog.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24669a6f7c---zewelukogalif.pdf
    • http://musorcentrum.hu/files/article/file/bokob.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/pipofijulowojuw.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160906f347c0d1---xigesitem.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7cbb0861---jovidabufirorutatejade.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lsaqltms6lo4mv88acs21h1ba7/70131335111.pdf
    • http://fandimnarodaku.cz/upload/file/sajusanopijij.pdf
    • https://buka.ru/sadm_files/62925216718.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/72f79834076a8e244fdbc357e745a941/39155247374.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/a6dbvn915d9d5bjnfkmpp3197g/42860936103.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160885f50651bf---wejatokatesuw.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e2f0ef6010b0edb5b63395951dcb4c5b/mipiliwexavifafusatokuf.pdf
    • https://bawwabatrizq.com/userfiles/file/95686151968.pdf
    • 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_off00013138.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 16792 bytes
font_01_sfnt_off0001494a.bin
2a9ee39cd625fef7159713691f56885e26beb0d9fd0af2c95c977264fa1f65f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1494A 18068 bytes
font_02_sfnt_off000177e0.bin
37269ea8f6ade3cde9f968d72df7dba8e95d982b7e6f03d86150d6cfffe6de7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177E0 10472 bytes

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