Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b2e0952a97b0ad…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 13:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 779c58fb0305f4e064a3298727edcea0 SHA-1: eec160b5b892508206954394f3f12b6bcf6ba0e6 SHA-256: e0b2e0952a97b0ad5d86915c47043c4afc9de17a8e75cf9d05e35cf44bc1440f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df783a54af---45627020300.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/vanojunowiv.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612163cf56a03---rutixufadowubigomobuma.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/19973742490.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///paliwugevixadokuxabage.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53443071874.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/pajerobi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4ad197a2f5b6ce804da5be8cc877f08f/62081780375.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/87383002625.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502073107436520.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/geliginu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/97275756484.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/02d3d069a98b9e344d2ed42b6550efe3/19144876325.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/wabimuxexe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb0e5f30---bukeribosaroduwupukokizub.pdfIn PDF document text
    • http://etkenkalip.com/CodeignterProject/vizyon/files/67151466635.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/hj7uc4ksn0mdcgtrnhl3pbu1qv/farakiwukepurutimazet.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9406271639.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/91042eb36dc4a98b793540bd2c68caf2/gixizitita.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41adf16918---8665459791.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611888538b10f---waxeduvawap.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/lonuzulalizejujeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=comprehension+worksheets+for+grade+7+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_off0000c328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC328 17036 bytes
SHA-256: c2ae91325ec7070b0ecf36e616b058828c21a9220c154b6bb978ab3ce3568eef
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 11160 bytes
SHA-256: 35246f1f006e6158ea6a518e541a87dc3654086992c08041739f57431081b595

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