Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8f9503ccdbd482…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 05:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfadfbca8ca99fcaf54024e923e61306 SHA-1: 32c363db2c458e856149e71d9e212a9dc572de74 SHA-256: 5b8f9503ccdbd482a13a40591102e863664f90f03fd6b6664e98eb7458359524
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update. While no scripts were directly extracted, the presence of numerous embedded URLs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious sites. The primary attack pattern involves social engineering to trick users into downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cestovni-postylka.eu/userfiles/file/jumonaruxobujefedomovub.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5ca6e54ff496fa5a348b40ef29428df8/92580243909.pdf
    • https://a2designbg.com/userfiles/file/64503916852.pdf
    • http://manpukulivermore.com/uploads/files/2544820440.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/829acf625d5afdce643b80a58fdd702e/febinoposen.pdf
    • http://multi-accueil.fr/ressource/site-image/files/woximo.pdf
    • http://atek-ent.com/upload/file/24364037405.pdf
    • http://ahlhy.com/uploads/file/29081600774.pdf
    • https://cottonweb.net/userfiles/file/27747864718.pdf
    • http://showpalmedical.com/userfiles/daxibejuned.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o82js307jd7enr3ahu299u64p7/4150881649.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609020906b6ef---96235577553.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82709b496ce557ed7bf2ecd53d4d3cef/pubafixipote.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0jg2i3o55pjto1hifpee2i5v6m/78906682886.pdf
    • http://klccpa.com/userfiles/file/rilofebisojenalugepafem.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d04f647308ce2266570cd513107a155f/29410891403.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1407035a---logiputariranovolubeli.pdf
    • http://lukinserv.hu/file/mafajunozuxonopi.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba66f1c8---wenabixujakowo.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074aa822cbf0---25538470734.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/k677ec38tph5ucka3ns5n7lej3/29684462253.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3f7d4cac---3336846926.pdf
    • http://allamericannursing.com/userfiles/file/23502873626.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=notepad+apk+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec3.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 16092 bytes
font_01_sfnt_off0000e404.bin
0404a0db2f27f7ef8d34ac26768e83de31692bfab035c29340733ddaddc6a1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 17176 bytes
font_02_sfnt_off00011109.bin
fca0686616db1fcc2d2f54495c09b8e4fca4a173052d0854f76f4ccfc0cfe17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 10240 bytes
font_03_sfnt_off00012823.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes

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