Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b029b806e63e055…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 16:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb396bff2f7d4db6d64650a15eb342c3 SHA-1: ad678f535b5aebb554e6229888771e2cb7140d73 SHA-256: 9b029b806e63e0552ddab4b6f69252cbc9fa5a9223585ceefb9a3c0c94c5744e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting an attempt to obscure the ultimate destination of the user. The presence of these links and the overall structure are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f022c50a---23292683034.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ad54358e7---68349287714.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/liwejiroku.pdfIn PDF document text
    • http://iscelenie.info/files/file/tunabosivupovazusekurer.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/77102675816.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83093486625.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/jodokotivorovo.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/86332302738.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zomamonomukitabi.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kazawewonazepabebaru.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/38143419398.pdfIn PDF document text
    • http://remobudostol.pl/pliki/64633656105.pdfIn PDF document text
    • http://chinalabware.ru/d/files/tojekisoto.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dezoverefunovizonaman.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/4242897312.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/feder.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b52598e7---14709552336.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/badalemejif.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161341820bccd6---gubajuxeguxifedib.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/zekinivakunax.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/21216445230.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/22190298241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=convert+pdf+to+ebook+onlinePDF 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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 10492 bytes
SHA-256: 19159f4f280f5777e094a670be7fa9ac2ed1f73b96bba1f4c22fc1cbea9238c6
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 17684 bytes
SHA-256: ef614ef668f1f687ff2367d01d6b704d785bd15506c6f5773630f7afdc6fd29a