Malicious PDF — malware analysis report

Static analysis result for SHA-256 365dbf13d8685dca…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 09:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e50f432f977b265ffb516201519adfab SHA-1: 93f84091bfc0662eae28113ff348752f8e8bc811 SHA-256: 365dbf13d8685dca89e6f9ea3f31e12b949888124b0dabba57b1272b7304f3a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ca7498de---21789848408.pdf
    • http://cdkuys.handysociality.com/upload/files/nupud.pdf
    • http://cedule-plachty.cz/files/file/64474395393.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/8273087014.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/tolizelodegesemake.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/75346510560.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/zevejurinu.pdf
    • http://v-lukomorie.com/uploader/files/3762255863.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8f8678a2dbf3b4deaac46b58f08f9e81/5526730859.pdf
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/56517402243.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec30d08e1---82868099878.pdf
    • http://kleinschadenexperte.de/userfiles/file/28804976076.pdf
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/27888429748.pdf
    • http://ljjxmining.com/uploadfile/file///2021090209204744.pdf
    • http://dakmet.pl/upload/zidapewixafofusolugaso.pdf
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/48341967273.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/18237609587.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210921102718.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631982478.pdf
    • http://sunnysolutions.it/uploads/assets/file/sokaziger.pdf
    • https://snowcat.pl/admin/ckfinder/userfiles/files/84168041101.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0a23a8d57b401e69c583e9ae7a4452db/22033190023.pdf
    • https://kanalprofi.at/UserFiles/file/nizikukagugusulox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=real+boxing+free+download
    • 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_off0000da08.bin
a8a8d3c160b27aa4fa74f48249fd9799c82e775ddaf12058a527ce6175f278ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 17336 bytes
font_01_sfnt_off00010726.bin
3eb735581568f214bf364e075451e968ab4c442876073052be1a55fa40e4d5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10636 bytes
font_02_sfnt_off00011f6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 16792 bytes