Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88edc3ff0cc9004…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 10:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 912099a9ea2266ba42f988e01ee0f061 SHA-1: 5002c55840c0a2d6df2bc3c19c2a559a1593b273 SHA-256: d88edc3ff0cc9004320487fb43e7a01c6740d02be86f0896657b97576d00b088
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URI heuristics and the compromised CMS upload link farm indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132986631675---84918051652.pdf In PDF document text
    • https://raljob.com/userfiles/file/97119412671.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/62017583117.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/94596938171.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/748f785830d7b11db96254159b6b9f49/pavobalamijivagupubitep.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/4993198628.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/80739494208.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/80444112650.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9d108bce---21982407746.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309b671c7fc---gopumexisu.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/tavinexej.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/kowonojijotajojoxujifawo.pdfIn PDF document text
    • http://ttc-investco.com/img/files/butefawupazita.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/juwakil.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/8819973970.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/1017401392.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/32054298000.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210908163112392458.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/jofexu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c3c19715---rigoze.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76928261130.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/19351634881.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e8ba29otd22ncl8ga6d04o3hf4/90446910984.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/23173984988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sample+of+thematic+analysis+in+qualitative+researchPDF 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_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 11244 bytes
SHA-256: b879116f65638c1ab1f826bc18f4809dda6b55a328378d77397a7771a7c6b386
font_02_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 18344 bytes
SHA-256: d79c650f6f4f36d48b15ac4654579005dce90dfb2b2a3942087492e7b8d73f78