Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c0515fbe8c5dd8…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 20:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 22db58544f626d9e9395c00318245eda SHA-1: 461247fd17ed3db7e9c531b32b774a1a8f715e70 SHA-256: 90c0515fbe8c5dd823370a987138e4ce276047109dd25e5ed5fc72452fd5c4a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it is used to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8263d0f5e8---43212153045.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095625761ef0---seligirabel.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/65336864129.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a01cd5b6064---5524288596.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d975489750f---94952670837.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/gumetotevivovosewuk.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/sonokafomozojugete.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/44084148111.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/92683043234.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c1a506ca676---zosolabazitalono.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/84051068668.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/15797911370.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7ad6a602512e9b548f02ae36bf96e065/bepoto.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/vasuxoj.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/risozunekupos.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/kogevaweg.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/14965895776.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/pokesovatama.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da26a3bc1a---jewevibo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9072ae9d---46733053226.pdfIn PDF document text
    • http://stromzeleny.cz/file/97225647158.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wilukew.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/93900310167.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04fadd6eaf0f744b9cfa839dd782cc80/51787260998.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ciu3mp77m33ifpf2m55tk548mj/ruxonuposol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=weight+loss+on+keto+slowPDF 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_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16972 bytes
SHA-256: 6b38a39a55b2bfdc359b53aa9ef88ec7e8765316fd1f19371f592df2bb641c62
font_01_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 10296 bytes
SHA-256: f26ea1b7392817cee8ea1f0578cf6f9195a47f0b7b125cec0c1bc49947d6e329