Malicious PDF — malware analysis report

Static analysis result for SHA-256 73923103651ce8d9…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 18:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0aa367a4e2ec5a243e288ddf5e704af4 SHA-1: b05b3700b600143e822beae80be74ae0f4beb756 SHA-256: 73923103651ce8d9871e514b61001f0c8bcd93dfcbd1f1d72603401a9b0057ce
196 Risk Score

Malware Insights

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

The PDF document contains multiple links to external resources, some hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The 'Remote-support tool lure' heuristic indicates the document's content likely instructs the user to install or connect with a remote-support tool, a common tactic for gaining unauthorized access. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saruma.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hsti728nfu8cb5jai8g8nribh7/nijajuvigigopetimivozum.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/b7be3531506a4260527261382c493d50/midagepefofageroba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca5b3715f---58833950379.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/jofilenuwixupejegefiga.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/begupuwerunudezoreziz.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/lasanamazadasanitejeva.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2758f2094---55598066935.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/rezorimilodawitofitagutej.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/12249972034.pdfIn PDF document text
    • http://praguetransfer.com/files/file/luxamanevalod.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4b1b8f23c95b4de3065a951ad49288f2/bizapozuk.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1d246d3f3c6f1dfb56bda7ae13bdc525/94815709167.pdfIn PDF document text
    • https://castel.ro/userfiles/file/25364380804.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d131d1cc1---74944648966.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5iqq7d39e58llvpav5hknjt94i/wedetofiwekodepofamadoxaf.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1075ecbd88---50234789771.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/3958630718.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/mudumoxutedo.pdfIn PDF document text
    • https://akemi.ro/hirek/file/julosikaxetij.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6369c406---64606853546.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3e85a4b5---94179801386.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/97550162894.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747b966a15f---36254470841.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da662954b---52913351605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cisco+packet+tracer+7.2+portablePDF link annotation
    • 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_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16696 bytes
SHA-256: 1c3355124674ec7f3eae54830753349f7075d610f1998406bedd4eb045cbccc2
font_02_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 10764 bytes
SHA-256: f05cbd180d9650434f5298925358f1dddb81ef5bbeadd26ad48fd67753ce39a4