Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac7adc4cfa74eb8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 14:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6fa99d0124258a0149d8120fd3626af SHA-1: 8d1dea71b6225c807911b3cef051e37d3f379651 SHA-256: 5ac7adc4cfa74eb8dba9fca07e146ef96eb355c9cc0e215eb79ac9ba309e9620
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smilaxlabs.com/userfiles/files/repedipodabufipimunev.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85251697fb---rizofawef.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/76765088843.pdfIn PDF document text
    • http://anm-av.de/uploads/files/30208563730.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/74374061348.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/lozikeme.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c2555d1b92d42ac502a0eb445fa0ff95/muserezerovik.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/fugusugine.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aff6ba805a1---muzusapofo.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/tizij.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0a47a3feg9ffl66i1s7oba8i74/68291368017.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/88610982894.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f190cb223---nusimerevomobozibax.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/33920751929.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63c087fc277ee8d114e6355f6254a2ac/lowusopek.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/gibodolib.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/74240156917.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef64a05823---gasadigapo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sepuxegubexetijivepap.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105bb268b8df---51533305822.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077718108502---7070316593.pdfIn PDF document text
    • http://fructusartis.com/i/File/50878343267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=3d+papercraft+templates+pdfPDF 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_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 17712 bytes
SHA-256: 33d84e2ee96a9f2abe4546b10f6edf1705e009a4683e49aa463c1f2e85652ebb
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 10540 bytes
SHA-256: 37c50801071a2d6c12a1c18a4a37919d00347a28a0803a43336e589d2ba1078d

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