Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef077be4e23659d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 16:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4e3092836b606cbb3707b94c50a9860 SHA-1: 70afb1fba54e2e84c1bf8e19e328c63934b51a4b SHA-256: 8ef077be4e23659d2308831437d3991606ff58e2535cf1a70730f46a47ce6001
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, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful 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.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e19d0deb---wijimexuxubadeg.pdf In PDF document text
    • http://france-ex.com/images/blog/file/xurumonalefekezotatujaro.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/12484791252.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/59673698845.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a598ade802402e2a3875dbf959f41120/zofezikutexakuzawevu.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/nexusalutadajunogixanes.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210920_144624.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/jiveva.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/pelekur.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/ruxud.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/duleferananujovekol.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/40011597414.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/poselus.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/95591818071.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/27340403001.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/fawubedapoxujozewazinis.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/40349695298.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/49458659311.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/lekinanonefevifilivejubot.pdfIn PDF document text
    • http://iucecb.com/files/file/duwet.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/luximulagerimokek.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dovabalomepugologoger.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/fafotugasasubazazobikuk.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3bbea173b---jafukenida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=russell+tovey+doctor+whoPDF 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_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 16568 bytes
SHA-256: 4a56732f64a4e0c62355ea4a2e36281258663fc14bc37406932fc026e3fbfaf5
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10520 bytes
SHA-256: 9c95ddc41dbd2aa9fb2c6a903321d24b062b0dc8c2a27e177c014ba930f0a138

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