Malicious PDF — malware analysis report

Static analysis result for SHA-256 18aa2d79389fdc43…

MALICIOUS

PDF

56.8 KB Created: 2021-09-26 19:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1e6ba218ae08b0af15083b0cb22e035a SHA-1: 89c8a0ab400a6c07cc3a933306eaac1a20d49f53 SHA-256: 18aa2d79389fdc4356032aeb3e2eae6790ddced210f96eae7a847a18da84aa1c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6002

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148629eccbfb---lusoraneverekusi.pdf In PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/gavazaxivivaraneluloref.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/42ad2e7f57fe30c4cea50a78498280c9/zojevesugul.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/48315506040.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161302ecc53259---gizitetivijeneravawono.pdfIn PDF document text
    • https://hiroyoung.com/data/files/71877304964.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/nexivuwulopiza.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/32929512032.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/5696153584.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/gidogozekorogebeliwafu.pdfIn PDF document text
    • https://polaria.cz/images/file/mapupegov.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9b79d6a0---wuloredir.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/desofojemirakadomamada.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/pinamatefikuvulunibedima.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4d911f1d---52685969872.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/vekitonowizidex.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/ridojujojozapejupukamejeg.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/dabawozumowekav.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/tuzad.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9719404e1275c9b70b139d0b586f7e81/49042447655.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/idhbsiiqinb6ofpuc3soh62tj2/37343134324.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/gezoditekalaxafanater.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/fikemimepito.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/80318348290.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc40a58ca9---88559928479.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/35783322015.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/72372168101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=apk+uninstaller+rootPDF 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_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 17536 bytes
SHA-256: fe9b4873880a3cdbbfa1accd5968e4e87c09c310f95226ee913c3a3a53aa5603