Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b95021fdbdbc48…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 11:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13167be4ab3ea61538b0e7c25b99f0ed SHA-1: b5c62b701a1327af18d98030cb33ecd902270772 SHA-256: a8b95021fdbdbc4889b9529ed093870cb1bf3fb62eb10d7a0f44f9226e58e90e
196 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a lure for remote support tools, suggesting an attempt to trick users into installing potentially malicious software. The presence of multiple embedded URLs, some pointing to compromised CMS uploads, further supports this. While no scripts were directly extracted, the overall structure and heuristic firings strongly suggest a phishing or social engineering attack aimed at gaining remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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 https://barrier.exma.cl/ckfinder/userfiles/files/semixuxejabatigewox.pdf In PDF document text
    • http://mobilenmr.com/files/files/70748104968.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904223129.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/fazafixixagojodopibuka.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/mimodivunilidiro.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/70682339090.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/48745369210.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/nagesa.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/69559500165.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/wamon.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/janegatekafe.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/55516907136.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306e7b04014---68966580132.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/kubalipo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb49078c7---pizox.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wapupenewegexadab.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/46978605161.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/53839528374.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1da1ad9c---74097368806.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d56f0645---8424364995.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161387d37cd9f1---64459290903.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/48129419579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=screen+stream+mirroring+pcPDF 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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 10744 bytes
SHA-256: b8c03335369468f631b3820e493dfad39e1ba5556acf7919174df9606c70e7cb
font_02_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 17712 bytes
SHA-256: 4a7b61291e89b711c493fefccb49dbb3db3c1ed11e51ad7a9796fc80f2cce1c4

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