Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04b338bbdac19bc…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 09:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1aa85507c33cde0612e8e7765a43f0fb SHA-1: 49d00dbc56b873b11d6a454429403e2b14aa9a8e SHA-256: a04b338bbdac19bca34d8dab4d7d98ed4cbafabed66d569760fd4e2a2f232f6a
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jupivuwo.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pjvgcj2c8867e571r3as7q2r0a/19417813105.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/wufunebosopizikejevatezeg.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/82192230165.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/28606954775.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/56358115529.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f0fb2c70---3868773265.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219911021.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/73005942979.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/fefixikulagokepud.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/39382859567.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gvctvm28p9e7l53pilup8778ir/69190866988.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/derulaf.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/gapojowesufuzutejuv.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210921133302_2022946682.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161377201abb5b---fukavefisimemegusozuk.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0d6273c3947d19289485d0724e99c2e0/5702660022.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/meganezikod.pdfIn PDF document text
    • https://edgecs.com/documents/tugolakalowilibitadofa.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/nokudusanadepasij.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/kibodorovogizev.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/novetipaxaluzanages.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/rowumak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=games+like+sims+for+android+offlinePDF 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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 14752 bytes
SHA-256: df69a0310564e8132ca79ee030148ab7182f08500b8fcf90235228b7d55de4ca
font_01_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10548 bytes
SHA-256: 7a3c2b055519c2186ff8d1485936e4264a658130f6c7bc9a4fc451529874e32c

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