Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43a905faae11145…

MALICIOUS

PDF

134.7 KB Created: 2021-09-06 07:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 873481bc05709254a63aa0e2f1f485fd SHA-1: 2ab446c42a59b60f5bc1e213f23d86ca3c5f46d1 SHA-256: e43a905faae111453bb8ceb47c1129a6bc19259e612cdff86eacd4cdd3385453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS uploads 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 link farm heuristics point towards an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607333f3966c5---15529467184.pdf In PDF document text
    • http://blueyee.com/upload/file/250338495179.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/4795735257.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/palaziwu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a5673c00f807f5adca4fccfdfa0b7400/39372445712.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6806606f1c---kevatosi.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/rabaxuxuledizenezokoxaxil.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/24687394312.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l1icuda3j6bhvg7hb9tl5rgm62/59266542062.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608371bfb20d4---7911945732.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/gmlvf5jad12usmg5gd5dpcsal7/pafexi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160740b4b6416b---gumovanoxej.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1780d14c79---92059657639.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/24988760704.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a5537ff64b0d2e3df0e78b77e06fde64/rumevov.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/6509502606.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/89030891796.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/wogutigar.pdfIn PDF document text
    • http://scsytech.com/upload/files/24271243511.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/88b1a87ac5f5a1527e0c851c418b96e1/95403650625.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2889eac1cb0c461073f3804136039e94/zimejixu.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/sanibibejijokaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=multiplying+binomials+worksheet+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A79D 11468 bytes
SHA-256: 43d308bd0b64d399f4ffa8b1ba4a26fa9df0e8bd6640a794ec427fff98eb4dee
font_01_sfnt_off0001c230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA42 19280 bytes
SHA-256: 8bb1a3d20ff9484ab7f9c980d9cd53492095194877d42d333d7cbdbc4135bd29

Open this report in the interactive analyzer, or submit your own file for analysis.