Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ad1a6de431b584…

MALICIOUS

PDF

84.5 KB Created: 2021-08-18 08:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73f90a06bc6cee0394491e9e63790de4 SHA-1: 183f45aeb820b758596a89ee0f50b9b809abb977 SHA-256: 48ad1a6de431b584a0007d6be9aede3cd98eed4ed17fdb524b9d8f66a1f3713e
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 websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links.

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 https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/vemusixepiwanexarip.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/q5jaijc30g3lsr579rtlmbq01o/79541891024.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/toxuvavutugefesikemasarur.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/xegijizisarexudewokened.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/46350993236.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5a79b7ece8a2f9f574a129204ca6862a/30378148521.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073539f6ce79---93283616770.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/57028804362.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec70f0eb3b---zebulenurajuk.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b487b7c3d65---57961590633.pdfIn PDF document text
    • https://nasikampung.info/contents//files/2616111673.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2de2718d6f---zifagagejixijifisolu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xudiraxefowovidobaxu.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/wegijoradinatesapewitogop.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210730_847CDEF3D37B023B.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7ioq0n75jq432kp9enqepvkd1d/bufixabe.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/zatijafimaxusovojet.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/tejeperoxel.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae19de2cdfe---80239888440.pdfIn PDF document text
    • https://emmaushuis.org/pages/49895329306.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/49465812727.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/01c4a4ddd5e1e239f49f0d65f8c7caa2/15757051335.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b2462ff0b69ca097660ddb9cd22c9747/gozoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=introducci%C3%B3n+a+la+filosof%C3%ADa+de+ra%C3%BAl+guti%C3%A9rrez+saenz+ed.+esfingePDF 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_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 16868 bytes
SHA-256: 13a9e83e1c92cbfd1bd3fe50c7b72da7e28a81d77e253d14b94cd3030a257cc0
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 11296 bytes
SHA-256: 5a6bfd691aa4c5d84bc07eb7c0e8eaf31dbc1eb985906ff8ea870c77e555a832
font_02_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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