Malicious PDF — malware analysis report

Static analysis result for SHA-256 04195253fc179d4e…

MALICIOUS

PDF

95.1 KB Created: 2021-07-25 15:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: af670b0a457d82497a6580f6ace20e4b SHA-1: 61d0912926d5d34b89f9f8873c31c2b35b4dfdaf SHA-256: 04195253fc179d4eb44c403831701eff922ef621a703fabcd3a13d7b7f4b72a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da0f05020---98799811910.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6c4b318e55f6362ab42f13aeb2c6bc99/92385679422.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/36953317036.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/80096668174.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kujabinunudafuboj.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/85700256495.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/32818687084.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/nufajirikunujuwul.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed58010b7---80570769336.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/69473988677.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/buwejumowevobakepikimes.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf1d9f0ec---91357525359.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/55914055308.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607151b596672---41583456950.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/zujufemibanunebusunez.pdfIn PDF document text
    • https://fasaac.org/temp//files/xowawezoxebavoja.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/duwofunoz.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rilozusebobifujud.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f112fbf879---vijoronepigo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73e6010f3---vunezege.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/13502674189.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/60846051140.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgcg282ptudfam0rvf1fpgpu9u/bokirulapokulapu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080378e8e41a---vupobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=anatom%C3%ADa+y+fisiolog%C3%ADa+de+la+piel+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10900 bytes
SHA-256: 10e1b036a2e8d1df8cc96fca98ebbba320b5a090ba00c1556eee8499bf685288
font_01_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 17632 bytes
SHA-256: 412df252383d2b78fac30049ecafa04b7a98267f10279f0d88226b2417ad0ed9
font_02_sfnt_off00014a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16228 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832

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