Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02721e0e9eda209…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 09:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fe39c8d460d805fbb64a9cac3b8d75b SHA-1: 5dc93e48ba383224d4270912ab444a6c7721fb4a SHA-256: d02721e0e9eda2096e467b8aba8d64284c1d603f128faf3ae51ffd76d1163227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://brilsports.ro/userfiles/file///80935050208.pdf In PDF document text
    • http://babamoleskine.com/files/file/namigetabanawomadas.pdfIn PDF document text
    • http://ge-mak.com/files/japizakomegexudined.pdfIn PDF document text
    • https://dhesient.com/media/59428473131.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109031018005529.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/92360860353.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf819387b3---tatupawivase.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/3081325893.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905212632432559gmu81cweazr5.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/96639320481.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/safugazitip.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ef63282b---xasarotopuwodomebinu.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/dixepumofuw.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xekenijijofit.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/bunozenipugaga.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/dazamemegiga.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/40625948715.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7b830f22---58751641119.pdfIn PDF document text
    • https://digireg.dk/upload/rojiz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9144e82f1466544ef4a090bace65c81a/53477824159.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/98737235288.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/32000471061.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u6cuquij69lgih1aen1610mj3/82718412205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=baixar+gangstar+rio+androidPDF 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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 18120 bytes
SHA-256: c9e078d07fa23043dee822c00c6ea166a0cf8a085120cc71713da41a7c8f07a4
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 10400 bytes
SHA-256: 1d5246c08adcf09d6b89408de1b716129d3910f2f156e0940aa41a5cb15e3ad3