Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4332800feefb50…

MALICIOUS

PDF

94.9 KB Created: 2021-08-14 18:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 327b8f49528c39e0cb7ebe334818346b SHA-1: 8df6b7e9304c243b18607c8a93f533420752f013 SHA-256: fa4332800feefb5010ccfb0a276e4f75340ee68174be004e4215ba77b5682df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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 http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b2d5ffe0---kifekuvuziwe.pdf In PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/velasojav.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/o4i33vko5s0gqltfkir1udvapa/89008032885.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/91065103991.pdfIn PDF document text
    • http://recrute.fr/files/files/80011552101.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/28/sodijuvifenojakixaso.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/pezufirilonisafogonikaru.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/xifarovukagut.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a6b8781ee---niwex.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/87777667905.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/48436408110.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/maxot.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061105551678.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/98027194223.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s4cq6nocpe5c0n7qt6bnd8qvma/tamivirojafasabirugize.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e6768f51---13302436566.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7b2521012197cdba782500b1862064a9/40173474308.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/faxuzeduvodikugajifape.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/leberutu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea632a2f7---55741754013.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32ae469730---94205484912.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b2b2e82013d67d148524cc1cf7de6cd4/tutizerakumetib.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/60758726652.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16114957c905bf---lelewijedup.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609881e092f9b---wilofavikemubepopom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=taking+sides+clashing+views+in+sustainability+pdfPDF link annotation
    • 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_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 17020 bytes
SHA-256: 4370173861efb592c15bbaafa77eeaa4f625b254c81c7dd9534a1a43f463ad0e
font_01_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2
font_02_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 11240 bytes
SHA-256: b24dcd8663f74d2486544fe6d219eeefdf072b9a40dec4772106aa093a9b3775
font_03_sfnt_off0001527f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1