Malicious PDF — malware analysis report

Static analysis result for SHA-256 63618fdc3681d2d4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 05:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a363c12d6f6dcb4ecb75c6341d5b0d6 SHA-1: b3f4cc2b8ab5e2dc53a0f0106217f5fd8d951be5 SHA-256: 63618fdc3681d2d4b3129ef92b5f48657173644fc9ea74a111155aa92d12f681
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is designed to redirect users to malicious sites. The presence of numerous embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ildong.org/sa_upload/userfiles/file/20210721115634.pdf In PDF document text
    • http://essuances.com/ckfinder/userfiles/files/9137161109.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921c3b45e36---mezeba.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/16088208382.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/80218095938.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ccc88628---8442492632.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s6mos5hpvqsv0ejdkknljbpc3k/91556049079.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/29169265397.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0593ab390---68369707941.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/mosuma.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/79709015822.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6b28a6fb---61579323551.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ba2f7018c---xebogezagonexelapokik.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062716021373499.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210803_74638E52E90D09C4.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608da363dbc2e---diwusupezut.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/pawalokavukowilosepe.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/22776029801.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795e46df0d3---jesuloz.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/notoronukigiruzamokuwozur.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/silebaxijitesawedezaf.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rovereno.pdfIn PDF document text
    • https://longhoang.vn/upload/files/jiwidilemifofobafixo.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/xuzesemez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=7+month+old+not+babblingPDF 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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10388 bytes
SHA-256: 110076f5d7797e8785b72095885f6a2c2893bf0891254481e2c61a073640b5bf
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 18656 bytes
SHA-256: 255cfcfc12b1f3a05c487c4a37f8dbaa6e26a760bdac42ecf365e9d5fd5a6e87
font_02_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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