Malicious PDF — malware analysis report

Static analysis result for SHA-256 240c195d15015702…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 06:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d210e0ff98bfb79088c3e746608f28d SHA-1: 8d99bbf6fabf59cd7174d0a78a2f59696d6deef2 SHA-256: 240c195d150157028dcfe4c3f63c2979854b2c65f9eaa28ed04f55342f19eec8
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate the PDF links to compromised CMS upload storage and uses a link farm on disposable hosting, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zepofixenolume.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d81f3c3d---87535450761.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/ruxet.pdfIn PDF document text
    • https://kawanmto.com/contents/files/fepopojabedibixiwufej.pdfIn PDF document text
    • https://phnews.ro/files/file/12516345614.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deaa66bdfb---fivorib.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/3056942846.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/fasekololuw.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/46985726453.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61034052662.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/73817095789.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e09e0bea---45287822676.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/74932901364.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/82928002135.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613284e464464---21113866899.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/17387433958.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb81e869fa---xozavejigumezo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370da99a1dc---metugudufaginuvusuv.pdfIn PDF document text
    • http://carszana.com/image/upload/File/gelopuzom.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/59169794759.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/xuxuborozenunezivigazowup.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/1966105326.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/73036808271.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/lopitawurawopisa.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/92861780844.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/38854102698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=plants+vs+zombies+2+0+sun+no+reloadPDF 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_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 11020 bytes
SHA-256: e71e22d1f16161f0675018f42957185cf64cad24997733c8292b0c7e82d22117
font_02_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 22312 bytes
SHA-256: b904dab3f7ae345f97362f21ba8a3e010c21fc5fe8a303afaf76daa7b1ab461f

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