Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e0ef1276e04c79…

MALICIOUS

PDF

86.9 KB Created: 2021-07-15 21:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 275b72dd4a8b4cdd2a32ccea574dccfe SHA-1: a8f4ade1f2cab793592e2d422e28b2211460e7bd SHA-256: f1e0ef1276e04c79ff53adf91fbc0ca1af9f9ccb0d56587deb266929499a4e50
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF serves as a lure to lead users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/60b6b92e183ae0556bbf141001576eac/mofizusobegivali.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8f61df40---86311793803.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0rg6dqrav68i0n5uj9qo4le75u/5483852877.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608611634d7c8---ravilaxifukoditawijazaji.pdf
    • http://globalquestconsulting.com/userfiles/files/nudilojadoxenu.pdf
    • https://wasserentkalkung.at/ckfinder/userfiles/files/23755062172.pdf
    • https://codecs.roimages/file/61955575465.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0ae603bf387b8f75ae00e65e86e874e6/mazilowel.pdf
    • https://littlelightnepal.org/userfiles/file/35872798812.pdf
    • http://axwelindia.com/uploads/folufuduferurula.pdf
    • http://www.trisad.kz/ckfinder/userfiles/files/fuzubus.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/06efdc95fafc337b389325ef9a2cb877/27923002442.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cfe0a8c8e7213774662493c2bcb945c7/karuwigas.pdf
    • https://tekmaker.com/upload/files/1327726194.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wiminekozofon.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b797ee97---80956620078.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f409a4d5---30093767669.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b87be96294a---tajujiki.pdf
    • http://dichvuwebsites.com/media/ftp/file/zijabagomefivit.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1b8b88997452c74270621ea5998244f7/26977195819.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5e6adeb2---45205345561.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/78474100183.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a876c88a5---49221743483.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/zusoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+1+hill+climb+race+2
    • 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_off0000e42d.bin
01c214e5fb835364db1da0a4c52385db3dde122dc86a820982602f48f1a1b62c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10660 bytes
font_01_sfnt_off0000fc67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16792 bytes
font_02_sfnt_off00011479.bin
c6d42e8810aab4d623a0cf1f592b972c03c4fbdc4c9ab72d111e8ff9fd7967e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 23284 bytes