Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a83638a2e808149…

MALICIOUS

PDF

87.9 KB Created: 2021-08-09 04:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 687cec82c90fc1758204f38c83afdd67 SHA-1: 9274b532d5cc67272be6513e90f2fba8136a373d SHA-256: 9a83638a2e80814994ea2dd7cdf9d05fd573f53bfe023673572182dda3645bf5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites utilizing compromised CMS upload functionalities, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6c1b7112b661a08518f7052cc2310f27/vexoxomuzolipajanefixolep.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57d0dc5cd---rodoja.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gojipi.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zakoroferat.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/71937893441.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/paletasixikimoxeroxu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/98475370919.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/33bbrsbf23rcknnddgnal60uf7/tebesunozoz.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af1f043a---gekodef.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/64295925839.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6e95fca877b3b46a717473a659277c4b/2735328144.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9cbac1101f5259eccc04d628361a7c52/voripewasumini.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100448a0d910---17279039213.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/78401312223.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/81415244147.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/susowesoxagotili.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/19349174312.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/gigivunukipumisamex.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/59868158474.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/nidoresusenolewe.pdfIn PDF document text
    • http://temple.mo/userfiles/file/wobosapodew.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc2c3bee0f---46651083190.pdfIn PDF document text
    • http://dges.in/userfiles/file/fofomipezimolapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=saroja+mp3+songs+free+download+starmusiqPDF 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_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 17096 bytes
SHA-256: 7826d2c51e4aae492efbf398e753f72d15e77198d4015ccaeecf81f40623b09d
font_01_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 11552 bytes
SHA-256: c4c37ad98b88b5d8b8c27be9622756283931d4fef7c4b09995515b6aa7fa4e50
font_02_sfnt_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1