Malicious PDF — malware analysis report

Static analysis result for SHA-256 75279e651bd8d496…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95d73a67b1301990ae1666f273a93f09 SHA-1: 1a86c0dabe30d0ef21f3e8393ddc39b682d093bd SHA-256: 75279e651bd8d496132d929168dd923ef64909c426c71c7bd0185e092a448e0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms pointing to potentially compromised websites or disposable hosting, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://namthangbasaltstone.com/uploads/image/files/kenobesoxudoxuxivogujiju.pdf In PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_27_23_26_40_2004.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/xanovowa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161439838b5788---4109003231.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/65781296075.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/66456297645.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/muwotepi.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/lajofo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/21216623782.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/gepipipeni.pdfIn PDF document text
    • https://coluer.ir/documents/file/razetotiju.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/44086024832.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/72779047883.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64935272408.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/96929005633.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/zuvuluzovizakotumugefor.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/22075662832.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/viperibezojuzemesis.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210909_654C3809CEEAAB2B.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8svuu2q8geim9but3u423lkmc2/bikixeduradunetom.pdfIn PDF document text
    • http://metapolar.hu/tmp/babej.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/kelexabixepivefokudupara.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/43c847e71220b8d9cbf9ab899283f68b/mitabojovulusup.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/55610189150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=it+1990+full+movie+onlinePDF 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_off0000b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB109 17472 bytes
SHA-256: 3307e6615f3960f38b8f469e5e3a444fb56f3432d384f9d66f7ec9a083d566fb
font_01_sfnt_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 10404 bytes
SHA-256: 7b25f6738c8e580f3ea906ec78dd6f9b004da51dc53382b49167b6034b5fa05d

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