Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad041caabc46992…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 16:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd0fd42c79eb14e45efaf47bec4c3af0 SHA-1: 132021c0f2ceb7fc50dd1f61211f22c64e4c43d0 SHA-256: 7ad041caabc46992e587b4c80e831f203426d18bc13a58efdc08e41b2969b19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613acae402854---rokatowokisarofu.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/46887451042.pdfIn PDF document text
    • https://agatanorek.com/files/file/81299081975.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/vomis.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/pemapimeragavim.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192152278666.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/mobamorajaji.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/36056027598.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/86413764583.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/63211422862.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/49265298697.pdfIn PDF document text
    • http://matras-devison.com/upload/file/92433567612.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/73418877822.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/31241235699.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vexejaketinoguwazuki.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8b49ce22ff295ae16640d6f79a16926e/metugif.pdfIn PDF document text
    • http://sdds.be/userfiles/file/zovititunetalajesivezel.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/86654081572.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614048881606f---tekuxufivosogatuletixir.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/38805874409.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/musotaziwileb.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e67fe37c78d5c60295411bb43470da65/83216072446.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/161131463434.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lepixijefi.pdfIn PDF document text
    • http://ternovykh.ru/content/file/tozetulogepit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+action+games+for+androidPDF 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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 10828 bytes
SHA-256: 2bea15a3d842d28264cfa9291962c84f67b4f7fc55f4bb06dc25c4ab56cd7437
font_01_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 17172 bytes
SHA-256: d860c8a2ba9d5fede4bcc39176196ff50b8365c71b18400c3078d0af19171a63
font_02_sfnt_off00013a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1