Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5ca1227a8984d8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 15:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1db839e8af089b608d8b01ac18c18f9d SHA-1: 6a57a211e3e5457f8f7e81f5eeccaa79478ba571 SHA-256: ea5ca1227a8984d8503d39aa62d5c894640211187b6477a567437bf63a8ac00c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to host a large number of links, potentially to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8526

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=stream+movies+with+friends PDF link annotation
    • http://netinflux.net/userfiles/file/75420638872.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/rofufasuxa.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614170ee9073b---tapuxaxebitafijitizadibe.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/49112250290.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210903161642.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/43549632247.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328aa006a92---babakogamefalej.pdfIn PDF document text
    • https://stauber.lt/images/files/lijuketomek.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zopufofazefimepaludalazu.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/61742420654.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/18746974935.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/53486705362.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/60187762500.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fc1e09307---rodefag.pdfIn PDF document text
    • https://mcsfood.com/images/file/tonuzegawigaxog.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/5792736342.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/bapemejejorapulojaw.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/bifarinefo.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/25787004527.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ded20163e---nivejubanorupovekomi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 18048 bytes
SHA-256: d9be845475a81ac24c10e680415ae968609eb0dd6347ac214fa2ff92ca3ca324
font_01_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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