Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b140b0d530d33f2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 15:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3744845040d92aa99ab812de56b9c97f SHA-1: 4779bd64a3c87513031550f396e2e11fd981bfc3 SHA-256: 4b140b0d530d33f2c288498c408c7241359908a25d308765e8934fb1266416df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/h0rmeko0iqirn1eah8tof5ie8g/17285748177.pdf In PDF document text
    • https://perfecthospitals.org/FCKeditor/file/jurifolojuzuxuwaxaz.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/pulufizulazetob.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/53129914077.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a9c74bb81a75451e9fb0221684fcd492/1752106157.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62932353850.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/45211648676.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/91988073841.pdfIn PDF document text
    • https://cet.sk/res/file/37979959552.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/90496950302.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/zugokewivijasakisiju.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/p9arp7tt5r0ekef8qckm1vg9mb/82422085302.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/81884170651.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/98429244141.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/388dacb4bce9220461558496bf0f2b40/rupitatawisubodadeniraren.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/31891710062.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/zizuforatibifafidoz.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/82693362815.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6568e68c3a2887882278343c61dcbe0c/lagote.pdfIn PDF document text
    • http://htwy.com/upload/file/43683570531.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/waninijegagilat.pdfIn PDF document text
    • https://ratodua.com/contents/files/keromavoxulikulef.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502001354110.pdfIn PDF document text
    • http://marymo.ru/uploads/files/virunokegufiwef.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/40437139122.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/50492858235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=davinci+resolve+15+reference+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_off0000b1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 16412 bytes
SHA-256: 91d37008cda7f8f29c79f35447bd39a18e06b4526b64e18dbf8264ab34079b36
font_02_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 10752 bytes
SHA-256: e402b0abbfc93088d9db18966918e4ad9d413a83fa8f5429d691eb330466f216

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