Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d7ffd12ed40f1c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 16:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c5e967ed3ee9cb17e74233042aab51a SHA-1: 8cbef90abefe485e48f8cd804b68cfeff8445bf7 SHA-256: 76d7ffd12ed40f1c7dfc9c1a70f7fa03a4459ab67d66cf9e5c061d0ef4e96b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://granchefpremiumfood.it/file/leketitomeguruzoj.pdf
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdf
    • http://nktrading.qa/file/files/fijavejemakutigiviget.pdf
    • http://alarcon-v.com/editor_upload_image/file/66228257297.pdf
    • http://daycamhoa.net/upload/UploadFiles/files/setamikiwubesinipemaposaj.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/809899f7a6410e7fcb23bb79b3bc07e3/gitubixozuxevu.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce57359411---lasileliz.pdf
    • http://christopherspubandgrille.com/userfiles/files/70333731229.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/jetirilad.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/96118523581.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500029b59a---70211301132.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dinn6sfhn8m4ses6tqbt3e6rgu/kufibapimewereb.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hsr4e4l6inalh1eedcmgjcjk55/46779719397.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fbcad2a01d26c99b634c84515b5cf579/gaduliro.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ures1l16ro0i77nfmggksjvqp1/womidenovizofukotade.pdf
    • https://ipic.vn/userfiles/file/fapomumosavofawojim.pdf
    • http://pcccphucvinh.com/upload/files/zifatomesefojevonuge.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/sisebetagora.pdf
    • http://meteosputnik.ru/userfiles/file/41794880236.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06e6af1e7---86521396927.pdf
    • http://curry-box-deluxe.de/userfiles/file/48192411915.pdf
    • http://hzzxtl.com/UploadFile/file/20210704061522211.pdf
    • http://4998horo.gmmwireless.com/contents/files/64716841490.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070165018305---korap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tamil+stories+pdf+file+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b16c.bin
a5353fd28347fcc6f270d92eb138d3b8f05fb8c433fe6ef981bfd7ee9dcb723d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 16744 bytes
font_01_sfnt_off0000dbb1.bin
d4eef9a2c914f2021bd0581528a08b30355f37ff371a247c6e0c2e1c55aff99b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 10708 bytes
font_02_sfnt_off0000f453.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16792 bytes