Malicious PDF — malware analysis report

Static analysis result for SHA-256 db167a350c8b9fef…

MALICIOUS

PDF

78.4 KB Created: 2021-09-21 03:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9eee1a611a8ad4a117e4d322f861b0cd SHA-1: 0f6254feda3c9c1b53019a622ff9db88edef56e4 SHA-256: db167a350c8b9fefcd90d44968c31d1c3ad9125f4a4c9591604e574c57c59e4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://milliondollardesiclub.com/upload_files/featured/files/sorowojemopidavonipisaze.pdf In PDF document text
    • https://allmassage.net/upload/file/20210907031837.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614081755081f---81475972563.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fce5669382608e8bff9e46f11a86afbf/71400590437.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/7962077739.pdfIn PDF document text
    • http://trieuduong.com/images/Download/21323204628.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/jirugusurulalezubiraruz.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/76749008590.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc1928dc1---pajat.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/tofekarenufowariwawu.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xoxuk.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/lomemetoxalubi.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/renupadubusenemudateba.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/venikuzusawi.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/64498326959.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/43446892500.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/20092090306.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/kevumevazawikego.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/jezax.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22559419323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lol+wild+rift+obb+downloadPDF 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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 16744 bytes
SHA-256: c8d9bdee4190832dc931f0789eed0d57568afb48ced09d553bda1f1ff553c0ce
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10232 bytes
SHA-256: a78ec4f39018635ea55cdded35ed9f1cac8b4931a647504fa58758cee3815ab8
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1