Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c8dbd2e6144bb4…

MALICIOUS

PDF

93.1 KB Created: 2021-09-05 22:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccb1524596b77746c937701d777e00f6 SHA-1: a0b19a3073b32b311f5465bdcbdab55b40174b45 SHA-256: 63c8dbd2e6144bb416c1276af0c5f4639ab5f2d21391bbb1d537ea8f59b95cbf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to files hosted on compromised WordPress sites or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS uploads suggests an attempt to disguise malicious content as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jonme.net/ckupload/files/65918527755.pdf In PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/65962972841.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0a4f52c0a384b29f4012a137bf843588/fibetow.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/73423600878.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/43850653615.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f617bed28---vidobilitiwa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a9764a739ba---9151772355.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/21685631054.pdfIn PDF document text
    • http://pbpharm.com/upload/files/67152563254.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07baee65da---feruzekejem.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/dubiromamavusemit.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/rojodutapanisajomebuki.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/50797174573.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/zevajorogodaxamovojap.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/gekovipadanajavufeve.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/46816511295.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/85933169682.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/molajoriba.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6121878a417e2.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/1417871633.pdfIn PDF document text
    • http://teplospectr.ru/images/files/78344973605.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/83660495689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nissan+almera+n16+service+manualPDF 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_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 10536 bytes
SHA-256: 60d7663a9ef1b00e6ccb700f5f371ede6704b849deeebfa7ed180eb9306afa35
font_01_sfnt_off00011a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 19848 bytes
SHA-256: 33de40c339114e9ddf6e29f4d95f530f7fa9973c909a5c87b9404ecfd69c9782
font_02_sfnt_off00014eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1