Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fae59eaf29b4743…

MALICIOUS

PDF

88.3 KB Created: 2021-10-06 09:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c23e3cc9d0d509302f57b0ed9df0a129 SHA-1: 02723c265190d522e733a1ef84910b221312d57e SHA-256: 5fae59eaf29b474302800da9d4b68ce07d4c2203fbf091345646dbb90bb65c5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to what appears to be compromised WordPress upload storage and a link farm on disposable hosting further indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ecohort.com/userfiles/files/sowekotuxowipavodugakarap.pdf In PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/43912063538.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b54532694f---mivuxuwaruzaz.pdfIn PDF document text
    • https://nistd.in/userfiles/file/37561801398.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/37948727983.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/11060224294.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109281252527193.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/52836136760.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/3151250786.pdfIn PDF document text
    • http://klaaswester.nl/img/file/zewenugujuveme.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/712d2ef7h5ph2dubjqglv7ijq6/32028575412.pdfIn PDF document text
    • https://grnca.org/img/files/files/50966860685.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/70877425297.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/96481295368.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ddc9bd813df21fc4a0a6dc4159d60825/35992328939.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/belevakapixaxavemulijefi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vmsrmih7etoodl80vqs1vls4c0/88414799288.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/nodudizusanil.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67380156827.pdfIn PDF document text
    • https://22importexport.com/eimages/file/77785876881.pdfIn PDF document text
    • https://10fci.org/userfiles/file/72320944409.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-10/file/LwpCms2021_10_03_03_47_41_2923.pdfIn PDF document text
    • https://naukriguru.com/php/uploads/file/walimuwex.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/pazujebavezemu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/vidifuriwivamekuj.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/19578745756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=famous+criminal+barristersPDF 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_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 18344 bytes
SHA-256: 46e6e9b142aaa36496542de196689be45afdef826057921f7ad3311b9e5588d7
font_02_sfnt_off00013ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 10608 bytes
SHA-256: f09aeecc0eb42e49be083659bbc8bd6fe5aa2627978d64aedce044fe91677724

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