Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ad8d19583062f5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 15:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 101424081411fb0f6d63c66450208a2e SHA-1: 417356ca15f7395ffca541cac7133a81ee34509d SHA-256: 43ad8d19583062f548fd3a637ebf9194a42c50b672ee0af44f7037e312d5fdab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/66f816f7f238cab3ec477e940bf1c182/36377965368.pdf In PDF document text
    • http://school19-zav.ru/userfiles/file/lapiputakelumakoza.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/20762895874.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/29403736245.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/90694218932.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a81d79f5a---32208073491.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1a24eab6653a07549e7b947bd5c2d73f/62307648736.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/75822890629.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/12142634033.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/vorufewotom.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/ribizamusaxonaloveb.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wibexipew.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/79784108905.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161416493a0d45---58190414848.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/90551682246.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/mawegegil.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/82619431237.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///95756342519.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/85451835393.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijujaretafawuvoj.pdfIn PDF document text
    • http://vitrine-prof.com/files/numolu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405dfcd23da---93490228531.pdfIn PDF document text
    • http://lejonhund.com/upload/riribumezevubofa.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/40112921571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+create+apk+file+in+react+nativePDF 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_off0000bcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 16952 bytes
SHA-256: 89e3ce4b7aa3f27cf78484be00cfd5686cdebea4a6228706e24730406236ae4b
font_02_sfnt_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 10540 bytes
SHA-256: ee1617c751294991c9cff18a50110cc90d92911bc12cd1346aa206e376ec0d7e

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