Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac161158d532616…

MALICIOUS

PDF

90.0 KB Created: 2021-08-13 09:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a4a0a6a519c850544ac240638f3ea5f SHA-1: f8d1ff3f346d8d13aa409a8d15d86f0fa8616e70 SHA-256: fac161158d5326168def438a6fdc1d1dbe021d41005185178a565f52c12ceef2
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/227eadedf7476ec5b90d2f03283b7f11/43208627864.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789fd45b9a3---tabetitabevegafitetiset.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/petujene.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/8719135830.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zeratuvutow.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/194db885b9fe89713a4643ec9d9bee81/woboxirozuwopagubavumu.pdfIn PDF document text
    • https://ivanamihic.com//files/78524652457.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa412a29549---42844126044.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vanebukupemojado.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/64889718545.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be911c1cf47---sujorudiziwegin.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/veruzamadarokejisin.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/9835089673.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/63015936331.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793aaf83ccf---23085477507.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/zivafupenoduxowox.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/85186006348.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/15773399772.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c00fcbea8---14453174627.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731028ccd28---jiloxonegale.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6e987f4cce94584223da290ef6d6cdcc/22853876563.pdfIn PDF document text
    • http://pnalog.ru/images/file/65357856901.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6epu9lkpsk4406mqpue4s09k6n/zedojitap.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/46548828660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mcgraw-hill+education+intermediate+spanish+grammar+pdfPDF 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_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 11280 bytes
SHA-256: d423e8c92fb0405a2fad26578bc2523a69eedd366b2c376f256342102cfa2569
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 18920 bytes
SHA-256: 2d333f0cbf2af05305e6c9755dd5463222ba48ab3ccbd11698e1804b941def6d

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