Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa533d0612a8d8ae…

MALICIOUS

PDF

89.0 KB Created: 2021-07-07 11:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 2df1730a6d94ebd65bbad1ea857047e2 SHA-1: bf5ab54e5636bd65b95da18b8e0db17cc553a9e0 SHA-256: fa533d0612a8d8ae24201f2d86e8caea44605fd4532f43f477561aa920cbe3b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=minecraft+java+edition+apk+v14+free+on+android PDF link annotation
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d86ab30974002b7f833c6833494b329f/28169968685.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f25cfebdba34976d22320f75d2cd82a7/wixidojotebotimutakuzew.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/4691747389.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7c7e5907---63183687419.pdfIn PDF document text
    • https://majubesar.info/contents//files/banapil.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e3dd7bb5---wevagodikakufa.pdfIn PDF document text
    • http://maihome.hu/admin1/file/nejibuzu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/34400634538.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/388c6bc2512d65d704ef28d88e6244a6/risokudinavevatol.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95eccaf45---29921855716.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/kamiretepitami.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608409c428212---repixuwiriremuduvafolase.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97401f0a6---kabigore.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kg5tdhopdp79cuc02vb30lvj37/daropovezo.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/lupedokivozokonikiferax.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/51839133046.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/22226014100.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c88f76e0819680eb8f40fe70ca0c8fa5/83910776738.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff493c782---6648488632.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cd3f1059c4fae06e71610f7954e9585/64556310449.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a016b18ef7---filibakug.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/20989721882.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/b5j687k4m7svkefs8ru62r843p/74762186115.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/1245068938.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105181555434295.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ab5914b18adade70f17b2fda36f37d34/tufiviz.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 18100 bytes
SHA-256: 467f973cacd6b59e2eb862f3aa051bd2cd26293a91bde28e92b6b6f25b1f826f
font_01_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 10808 bytes
SHA-256: 37b8039d351530912cf8c966fafd7e55360d6f7627af07bbbc0bc595bd4d75f0
font_03_sfnt_off00014d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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