Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d40264cd84a78ed…

MALICIOUS

PDF

93.7 KB Created: 2021-08-08 08:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b415bf32f5e3a2217de1af264fec9ab SHA-1: 190b82b100f287b3fda5b6431b1c9282f47c0d31 SHA-256: 9d40264cd84a78ed9fe0a75c1913bd1116513bdbf239879e89c4c0955d38f018
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d04e715381c4df5bd13aef29e0f24978/75536482593.pdf In PDF document text
    • http://ajivikafinance.com/userfiles/file/nidejelimiligijumaxit.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/94482479615.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/89234142719.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/88636755518.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a56586da076---fagiket.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/3198463996.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9229568c74ef0d5fd084b1a09c31150a/zaneradowe.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4756b4d4160db7aaef1f91b291286cb3/tosenuwagebanifudevitopen.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/326b445330cd8ba53d1baf6905c8fb1b/1219062922.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608380717865e---wefarifekedomevijugi.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tazimoz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dd5e341b5---52884529259.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021592231249526.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/54955753356.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/nopokoxavubizakuj.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e17d430ca---81157652985.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10bc5787c---suwixinokaniselezisuwa.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/ruzunewuv.pdfIn PDF document text
    • https://siroyensao.com/upload/files/vuziruzexijigodono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2019+suzuki+swift+sport+owners+manualPDF 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_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 17288 bytes
SHA-256: a2898a575eef8450a2a1ab2eec64f57706a7ebec0b38792537ac102a9091ef22
font_02_sfnt_off00014dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD4 11224 bytes
SHA-256: 7fb530fd5911ba132b18d23a392e10a8553f12e42a84fa6dd85ff67c20b5f6c5

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