Malicious PDF — malware analysis report

Static analysis result for SHA-256 03935fbe09aaa0cf…

MALICIOUS

PDF

95.1 KB Created: 2021-09-01 16:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 393fea080171f7d178acaf89097f6533 SHA-1: e86b54009c71d745a83d6ec92053925387dd90aa SHA-256: 03935fbe09aaa0cf90ad4728de4540a138ad125d501db4d88dbbc89ebd0fa863
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://epmresearch.org/userfiles/files/24357988756.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d161c64651---13198357801.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/49536653831.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/41036205342.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd8748461---setalorewepamet.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n50s5725a712qbtv1h1nka7kr4/sanoke.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/638046191868a289e35d5a2321429500/makaju.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef0d5eb14---dodiwejemekevigezerikaxi.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/36855811319.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/33803302831.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/pmihv4tuibmj3hlrq1ufp8s4p9/vubonamusapunud.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/80252060357.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/lisizenipubiwipimumivasu.pdfIn PDF document text
    • https://denimder.org/resimler/files/37064395283.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3dffdcd3f4afff3bdb65b16d7e59d439/jowujegasagizu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3442367974---tizelirodopitobumatajo.pdfIn PDF document text
    • http://waypl.pl/upload/File/jelaxifezijebusizok.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126319e9a42a---pefarelerasosatowe.pdfIn PDF document text
    • https://biocoils.com/img/file/disavate.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/31869272262.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/sidinixobafevalugefu.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/73560372240.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/68749109500.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2a3ecde4---35673411891.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/93725009270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=science+10+unit+4+answer+keyPDF 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_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 10776 bytes
SHA-256: 14242f461f6323ebe11cd138472c1761aaef0c478d8a4997afff3fa3834a2261
font_01_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 19584 bytes
SHA-256: 5b689ee3896f93bdd16806d918bf437bf8cfed9de856cbe6b41feedace2d07d5