Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a09364d30497a35…

MALICIOUS

PDF

58.7 KB Created: 2021-09-05 03:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9de5f4261ee2edff61245ede022433e3 SHA-1: aca11253e26ac1e429b60a902a90a5e5f589914d SHA-256: 5a09364d30497a35df6e30ac9aeb66855dfb44747b32d4f454dbc55b3011ad7a
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The PDF's structure and the nature of the linked URLs suggest it is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8279

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://essentielles-theater.de/UserFiles/File/45160224477.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1fc1ee2af8ecc2db79e46dab5c11d87f/50818422631.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/56098042308.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160846f7f0c093---72016454436.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/40101430921.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/75914956262.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/74442724212.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dd7ce9459a429fc3e5d3f1fd2ecb2355/29835924244.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160756e42655af---popatofositunimutisuji.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/83272156287.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/nudadekenaxumozifi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/o5auoka42stmbd025ntmm101rc/wuromorifedi.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210903115538214491.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183b5a93158---6940888605.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089515e7fcbc---niwepadizukulow.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/31170062711.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160772c41629b7---7880782456.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b8351e999---46160871.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10178b9d2b---womiliz.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/xunevejivuxodexevizesavum.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774df44f3ba---vuzulobat.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081720553917345.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/23102939555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=guitar+chords+chart+with+fingers+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1