Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4ad599307796a5…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 19:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07178f3b1461a5a815e8a1263ad97381 SHA-1: 698a3978910abc7a897dcbc2771575cc2943c892 SHA-256: 5f4ad599307796a556484262a3b6a74a6cb5feae1772bf2cd1fbcee160b1cac8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts hosting PDF files suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hgdn5oa386sel7oqs9v5uj4pv4/tuvoxabipakomimes.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d79cc175---pidoxapesiserodireze.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/233ffcbab1d4cdcdf2a46de9c3b0f62c/jetosiluvinitifabefisimu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f23c3c6a5---jalafedazobigepeme.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/getidafekifazavo.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078df37d588a---tixalapolomobidijiwow.pdf
    • http://fletcherfamilyreunion.org/clients/52745/File/82527723476.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6kinl8ub4aujg1p1feug4tq4n2/pigisubiraper.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b07c640e---46012404704.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fc7a4d81---18697853911.pdf
    • https://bamfieldrental.com/userfiles/file/90502306229.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce15c20a85---98574713100.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5cb3aed6674d24d4d27773b0ca037eeb/pujemumerumo.pdf
    • http://ahkjt.com/upfile/file/13377516402.pdf
    • http://sparkpro.lv/content/file/48793223508.pdf
    • https://argumentua.com/i/file/36950515052.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4f89b357---47536154146.pdf
    • http://www.asap-recruitment.net/upload/file/28042193151.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f967e5ee7a---76440553257.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0fac2d4f---kobaximodilaz.pdf
    • http://taskentcompany.com/userfiles/file/nuvozumuduriwam.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5vmtmbtj6e1m5092k2fv5sgtk7/bipopukudod.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edbd7a3a4---zovofuzeziseboxujaderov.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/pobadipineju.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2ff3959e2e1d7ab8802ce5446c1afab4/xojujorexopuno.pdf
    • https://lienlacanien.com/img_pages/file/30861567374.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e6d90297---60159095215.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jello+with+pudding
    • 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_off0000f728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 16792 bytes
font_01_sfnt_off00010f3a.bin
6e6f79987a56aa5fac70fd3fc17be1dca4af094ea713bf7a4d42f1e1de20995d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 17408 bytes
font_02_sfnt_off00013cdc.bin
0c6177a0f165e6274aea3150f5f2a6eac7ad91c6cba26c0d40f54b2961053b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 10416 bytes

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