Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22fa030cbf00d73…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 08:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca15a87924529b6584d2fc7c987f65d7 SHA-1: 8a922ed728c8c13c36d317206cdbebc400fe1319 SHA-256: c22fa030cbf00d731f252fbebd639ce9ea4b8cd840645b9aeec0d04702afb047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the nature of the embedded links and the PDF structure suggest it may exploit vulnerabilities or lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://chezgregoire.fr/userfiles/22949737069.pdf In PDF document text
    • https://nyirfa.hu/uploads/files/27052713202.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///gemepunotodesaraw.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/53417612906.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613be66538492---5051753609.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/muxipasiroxudaxaboteko.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_180450.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388057dfe54---31264370252.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/45014917983.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb25713dcf---mofusad.pdfIn PDF document text
    • http://retrofotr.cz/files/file/4808685752.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd8f98061---wekizepuvegekekefu.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/sijesuletamo.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/21891582516.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/wibilizeled.pdfIn PDF document text
    • https://oasis-travel.ro/files/74132916423.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/89433896116.pdfIn PDF document text
    • https://insp.biz/img/file/11980548408.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/59086820988.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cf05d53a2307b4f6bbf6fb8d05ff7285/fopadir.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/45633865348.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/80393445330.pdfIn PDF document text
    • http://drivetripper.com/userfiles2020/files/neworavadow.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ucmt9hc1phbl88asmeo4cgpgt2/96728892441.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/29905184389.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/79825907980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=excel+to+pdf+cPDF 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_off0000bca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA0 15888 bytes
SHA-256: 8cf91aea85008bc02f7aca420d2042663d3ac94af810b6d67c80839659353595
font_01_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10072 bytes
SHA-256: faff7759b38ca34a01e921b61e8e5baf0632a53d874d5733601040b2b3332bf8

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