Malicious PDF — malware analysis report

Static analysis result for SHA-256 13395a876abc34d3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 13:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bcfcc3e4fca754e89dfdbd76bc957516 SHA-1: a4ebb3928a332f44fa33059f19a1ee4e28b05e74 SHA-256: 13395a876abc34d3b1ee53c1ca8c145f29254800adb9916ae83165dc9a355773
204 Risk Score

Malware Insights

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

The PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering tactic to trick users into installing malicious software. The embedded URLs point to potentially compromised sites or link farms, indicating an attempt to redirect users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=chrome+android+open+local+file PDF link annotation
    • http://angelcabrera.com/FCKfiles/file/wixuzumu.pdfIn PDF document text
    • https://kultmotor.hu/images/files/9821276764.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/labipowiwepajopej.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/kifumunokivova.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/fetalajasoduf.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/67959923071.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/66301599948.pdfIn PDF document text
    • https://felicityokolo.com/file/40645165535.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/38578607725.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/rivujukukorijogedofiliroj.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kizofonojikufebi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/26175579823.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d3faeda9---23258489000.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/siromamugodag.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rht3rguvan0s84j24n11idicc5/famiwuduwo.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/8728918403.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/raxetaziliselunudigi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d749c769---gaxibitas.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/17417579273.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/rogidufimituriva.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/rutotakatexixumujoparara.pdfIn PDF document text
    • http://kftchem.com/upload/files/dezurafesubiwokif.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe62ebfd65a2b1777f8b24bc738b8525/27899435010.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/69549338745.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/jupomabat.pdfIn PDF document text
    • https://masukpt2.com/contents/files/zafibezabub.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caa14f12e---vulakav.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/muwemidejebofa.pdfIn PDF document text
    • 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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 10652 bytes
SHA-256: 85ca00e1864dc4a74f3683c88029d683056794027754d57d1ebf5e74c528a88d
font_02_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 18672 bytes
SHA-256: 80ae97cb9b6dc3df031a0112d21b5659ad9dc5ad917079aedb1e97bd73cb5cfd

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