Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0fb9c951ee4c36…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 23:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c1cd2b28beee25dbe38e8b326309dff SHA-1: 435f02ddcdef372d45c624c86cd64821a5b9096d SHA-256: 8e0fb9c951ee4c36de54ac9e857fea2401600e5a0f6da7e85e6535d400f8823f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dxczx.com/ckfinder/userfiles/files/20210909_000728.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7306564f2---xurabo.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/26375231528.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/rokexile.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1e7fc26502ca493e1cbfdd3b90d73776/1682731555.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614423eb12486---wamaveriwawe.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juxibeni.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/pusidirize.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090412183473499.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/60605669715.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109121231149477.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/luzafejatigexodunituxagad.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/58164838502.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/kunaxejapaberigob.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f8bbfe9f6eeff4407755a2e84ec4fb2d/vigaxotuteri.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/xetupoz.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/48720509212.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/danudonivebo.pdfIn PDF document text
    • http://esangsok.com/upfile/files/98069817417.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3779dfa8ce4b4cbe3a1c56e6910d2a10/93392125698.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/konojajigobesujabulop.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/76207305282.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/15154740389.pdfIn PDF document text
    • https://paradigma.bg/uf/file/87555633357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+draw+manga+hikaru+hayashi+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 18900 bytes
SHA-256: 1ca823f163811ec6c928de53a8db05619e11092e7ffd133619e51174eadf9b3e
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 11152 bytes
SHA-256: 734ad2c8fd5a46b33224c4ce6e04b8227013912716b7421402dedcae6b6e8a07
font_02_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.