Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7168a4399a94bd…

MALICIOUS

PDF

87.8 KB Created: 2021-08-29 12:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca2bffc47a8b0fe5a3c10d6e1e5b4eaf SHA-1: 8e0285b92ef90d4aff783122382faa7e457c61f9 SHA-256: ff7168a4399a94bdbe7acdd90e802cae734b92452c50eeffa66edfe9ef3bd5cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://paeonia.ch/userfiles/files/fujidinokomititax.pdf In PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/pudamimuz.pdfIn PDF document text
    • http://atek-ent.com/upload/file/zarugewi.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/55870548546.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2be33d68dd---zipexufevanewopadite.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0dd7deef2f8b0af658e70f84bf03a2b3/mujovisof.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ea4ub5lan4ud2ivf5ck1vk8fua/bunuxogetilisemedupikul.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxozipunaxuwubevij.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ti4s701mlmt05pa1sdie2ifc08/jexebe.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/gutesolo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd014b17e9f---mutanik.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/djdjsvc32ssv05cra09epuohtf/16738030621.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210806100939.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c482f558---mesuzotuxux.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29edd995aa---matokibefad.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/xazimakodizijinowazulor.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/59199090366.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/21662126778.pdfIn PDF document text
    • http://locke-3c.tw/uploads//files/202108022103282943.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16129ed4c6a519---vulupijabofaguwoxok.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/40703440984.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/46929038205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=examples+of+turning+points+in+lifePDF 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_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 10888 bytes
SHA-256: e89cb1bad808a80a34b23c6e92b34eb02c18a3a3baecdf5dd4d075685b03a926
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 18748 bytes
SHA-256: 513d059ab7700248c992ba4f8372c6d56ded9a57757be652c98b2092ff1f0ff7
font_02_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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