Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5aa159d7e12f6e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 19:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb47ebb0a7492b51e0bab117d5de0bde SHA-1: 2d0624e43ac81245629a528efe4eb962f45e852d SHA-256: bb5aa159d7e12f6e773441c77836f3186303141852312b77f75c8e5a0ee546d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure users to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • 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://sanyosushiglendora.com/uploads/files/fanefulalavukaz.pdf In PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/mewebodirivij.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/soxibizukikavuzifu.pdfIn PDF document text
    • http://yejida.com/userfiles/file/11527576275.pdfIn PDF document text
    • https://rosycaffe.com/file/kimeruvuso.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/molezodiv.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/xetotafojaluruperinobev.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_090931.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/milolijakimazalusexebog.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/87562426413.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/xadevirapasipavego.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/82428086724.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/95701080481.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937ded0d29---97766026478.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/99140158833.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349282b4495---sodeteveredexoxugeb.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/44210148029.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/71856998562.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/monixisexire.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/gewesitajixo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/28469345127.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/deledanavileroz.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/tobaxed.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d90d2ad8---63057223937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=one+way+the+elevator+apkPDF 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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 10472 bytes
SHA-256: 0a801cc75d95915eed006219bf48d6168c2ad8a2e39aa62f5ba78854d9ea57b6
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 21128 bytes
SHA-256: c824aa16a0fa47de2f5ed05276484bdfa022227866649621a026438ba061fd5d
font_02_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1