Malicious PDF — malware analysis report

Static analysis result for SHA-256 c499a3df737a01f2…

MALICIOUS

PDF

106.1 KB Created: 2021-08-30 20:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 227a5b84e38ccac5d8be51dac3180b85 SHA-1: efca0ca64b46dd616fd5a87c5a91adebdbe2ad03 SHA-256: c499a3df737a01f298d0cbdff4a5598c19c7ae961bcb156792aecaff2679f427
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. 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 0.9966

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://garglob.ru/uplcv?utm_term=legal+practice+council+rules PDF link annotation
    • http://qkmedica.com/uploads/userfiles/file/51600488500.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/65207571330.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/bolafojugagafewe.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/mcs40i65scgk4160on3cerarm2/metovurajudotixowana.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//93299862714.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jefnvs8rn6dhr83vj3arntrhud/96926374294.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9c020fd778a1ddbd2c8d2f4001cc78ad/zukotevo.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/zuvemivokekepigezipur.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2318256add---tonixazevanejetuvubivoku.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a9e029da3df26ab0bcf16927eda10877/89101096513.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/ketoxazisolixovefobivegag.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/92622789269.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/10271097274.pdfIn PDF document text
    • https://noddy.nu/images/file/71774366014.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/414967964bd5a381e3e9f1b3b8f28b65/2717697338.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/89a2623bb03b5e29cb40afd311a23664/latotonejozobumasoreb.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077173453eb7---midapulibov.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6e802cfa9e81f8eac5246adacbe473bd/1146386428.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/duwabebeguverame.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/66579025267.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/67490698814.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f7509ae0---padajixuzemevavivopubajox.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf46a595d---vinazasakopalare.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/56625302109.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c7a2c3727cc2d9fde2af2b6c576f2ef4/20599943579.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_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15119 10608 bytes
SHA-256: 821904cbbafe2e739dc55b3de4a2f0b9e67529cd444dd5dae054fe76186bc286
font_02_sfnt_off00016970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16970 18412 bytes
SHA-256: 4888afd83bab0a1e22df55c92907d5c7ee188c6a7cc13e5c5c840c132ad3c1fd

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