Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50af7762677cdc7…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 02:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41c07b77e9b6ba6dc4c36479d1e4cd2f SHA-1: d3f3c437029c64cfd6723c5e3c6441b7101fa1cc SHA-256: d50af7762677cdc7782a5767e4714a7439507c847efd995f3f2dfaa12ee99189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=beautification+of+a+saint PDF link annotation
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f93d9263b---49899544981.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab2b399a2---sodepemesonetejeku.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/15cd77493a39e013430c36f5d3d74ef5/68415060584.pdfIn PDF document text
    • https://12shio2.com/contents//files/20798147907.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/11272758477.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/rirowamegugoj.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/38873247714.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/19448753577.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/gugamejexo.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/riwoxar.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16118c5f0a71e0---57335361291.pdfIn PDF document text
    • http://yoron.net/up/files/24250590035.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e970e9ed1---tukomaxesesib.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ef0ae573ac28cbedd91d862399f50b81/debezofovuwewuxek.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/q08djjvfkj721sve9bmg6plfcc/91286014997.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/dd66032be4b24e3b11f5c5cbc98a9bca/gijowutoxoxano.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c331c2bd7f7---98119048591.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/89703578091.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/28704901092.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483b7674ab---29063906718.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/94113630286.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52a79382a---tanuzosaki.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/45048052086.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8a301679187e90846001212ad6c8cb58/vovakelopoperavob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 17320 bytes
SHA-256: 6d3c45b69146cb777c4f11ce8140b00b221f3851dde52c4825ac6a381f9d2795
font_01_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10336 bytes
SHA-256: 40ab185f71b02d5dd94c7b3a421bdd4d33d6301dc5c884ec70fefd3ac2ea3bfc
font_02_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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