Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b286028974159a8…

MALICIOUS

PDF

78.7 KB Created: 2021-08-29 00:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6e6f1c1bee96544af8449a10daf5782 SHA-1: d146465246b17c6a695bd959daa58e84b5b21879 SHA-256: 1b286028974159a8c95751987e8e665348bf7145d19eb48364c396d11562ed56
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, directing users to multiple compromised WordPress upload directories. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cdce37---foxudegibawinofetupukoz.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160947d13515ec---namenuvupeje.pdf
    • http://historia-bfured.hu/userfiles/file/kenumefi.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611edb3d07f38---57145396277.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/8785982737.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/uburqnhevv7qkev2b18iufa1pt/karuralefikogurodexedud.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9p105o9c1vngtjt082qdajf720/dugasaka.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/gokiputo.pdf
    • http://www.bash.cl/media/file/fegulapikijipulikoteb.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a9775da.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/32cef362147ca956e77c3629c3368182/pobenagabofupuzopogorabe.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/199d1dfe4f183f62d2e2ad1a135686a3/27207084982.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e278756eb8---87801740137.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071935ce94b6---seropopo.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2e7d75c92f48539b8f23c26ff1bd952f/95705048080.pdf
    • http://angeladaniel.de/uploads/files/94989616137.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad456f97e---xuxavidaluvogazex.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jo7hdclacq1e6tu00253eathp6/ledujadowixefesuwo.pdf
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/72754649550.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/78b9332trdjtd871qjkvianpeu/15276757110.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/65525887960.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0277c24a---rajiwekafosutipevekifuzup.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ec9f12f6---lunukolotiji.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7d2aa637---gilibes.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a009366f3e8---45404274242.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tipomolinabu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=do+you+soak+clothes+in+hot+or+cold+water
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02a.bin
2e2386d4ba9ea613f0ea76b33abf74e807f78fabb5618cffedf202df2f9dc129
pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 10860 bytes
font_01_sfnt_off0000e948.bin
6496e2780376727544172402ca1e500e21a1dacffbd70047429e70cbc106c589
pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 17064 bytes
font_02_sfnt_off0001153f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 16792 bytes