Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d72bc5b05e25a9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-11 08:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0c10e6c286bebc61548230f7d9c7d83 SHA-1: f27d61b830cdaddfa88183456a62257fbfd4edc2 SHA-256: 27d72bc5b05e25a93546eb2480b2da294b09fcce05d6062491fe274a69b98861
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ever-pioneer.com/upload/files/vasaxepebajutufavukox.pdf
    • http://www.s-prom.si/fileupload/file/nifarogufozakideb.pdf
    • http://belean.pl/userfiles/file/16255891465.pdf
    • http://sunmoon-glory.com/web/upload/files/42933233250.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7093cb14ef4d7b5ede7525a3165016e9/71074650453.pdf
    • http://southerncross-ex.com/images/blog/file/54581088850.pdf
    • http://a-b-i-s.net/layout/bilder/file/38642673490.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132517a3d767---robil.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f32701c447de3be1eed6d00552319f0a/begoxepazilexifo.pdf
    • http://merwepizza.com/upload/file/jofitususigi.pdf
    • http://zonazero.es/userfiles/file/tevonanebup.pdf
    • http://eminenceinc.com/userfiles/file/14994786409.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gukilizebazovevotute.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f9f253c---48161592657.pdf
    • https://pearproperties.in/userfiles/file/biruvadunagegijob.pdf
    • https://speculatio.in/ci/userfiles/files/21590079362.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16133d787c5c62---24549713443.pdf
    • http://faradbox.pl/files/file/53003561820.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613582e780260---74502783632.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/zijudupuzupika.pdf
    • https://artasedanasingaraja.com/uploadfck/file/xagetig.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/folaxaworasasebifo.pdf
    • http://pevak.info/UserFiles/File/17751164484.pdf
    • http://kliknetezde.cz/admin/obrazky/file/12792806077.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=car+parking+4+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c179.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 16792 bytes
font_01_sfnt_off0000d990.bin
b7ddf9a9d236a3fded105c1b0b21588c461e54d0c8ba546e84bdc84714dafe60
pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10492 bytes
font_02_sfnt_off0000f125.bin
3ce6fba06a8be556c91b31758c59d6a6b21dae4165fbdd43f42a951af5cb7d92
pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 17496 bytes