Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a821be8db74aa44…

MALICIOUS

PDF

85.4 KB Created: 2021-08-15 00:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a86b3329cc17e63bc7dd63a2ee83464d SHA-1: 92f1bf233fdeb00c6b6dfc17ad33873d6b1c7d85 SHA-256: 1a821be8db74aa449b0501f5aff9fffb46ef6bd37d9ae67f779dd371256cec49
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links are characteristic of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/86bd329609dd4af9311fb151a25eed1f/zatosoxaxilozisaf.pdf In PDF document text
    • https://alate.org/admin/fckeditor/editorfile/57846421163.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/mabesagikugijitomupo.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/dawazawibosodimuto.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096816e3da5f---pimizokaxatusobavajog.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/varedosujomokatemafim.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jeguzirilow.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/vilewejizifizi.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/89981156079.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9536c55972eab94f06b4280adf423320/senifeva.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/zopuvezekuxegejoxe.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ed1ce96a---31227672230.pdfIn PDF document text
    • https://oversaslogistica.it/file/63418191076.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f557cb2a5---wezevisipisetuligasizajij.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/96347431934.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a061b93a1a---zonetekaxenikaf.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/fekebonefe.pdfIn PDF document text
    • http://kmsenior.org/file/files/robabatiraxekovodavufib.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18363261776.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/89093031305.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27eb4388e8---tudaja.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/46435264352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cable+size+1+awg+to+mm2PDF 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_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10736 bytes
SHA-256: 7e4c2f23ad1b738ecc92dc66f2dfb8bf18e4ff4951fbe34aebfb7c9057a1e448
font_02_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 18856 bytes
SHA-256: cd43224887ace45f890ec5e3cdeaa65728f10f9e91db3ab90c46f32d65794148

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