Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7323091cd4d2b1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 00:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 374448796f3253678e2b47cc4d806f95 SHA-1: b4b2558968ede3939a756e7670623fac6b8cce64 SHA-256: ff7323091cd4d2b12161244697a4ccf21fe0c55cd6a9f56d300eecc065185fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a deliberate attempt to obscure the final destination or distribute malicious content through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.motionmantra.com/userfiles/files/40348159830.pdf In PDF document text
    • http://share-world.tw/userfiles/file/fekivisulik.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/62890310300.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/81691697125.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/16401822126.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161342698409ba---83517844916.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/giwabusumuta.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/malebatow.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161378b79c6af4---kunepefep.pdfIn PDF document text
    • http://hocomesun.com/upload/zoveparajamelofijopi.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/92458890214.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/92070148683.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/90833537175.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/tofimeju.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nojitej.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/39158600060.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/81635828386.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090722204673499.pdfIn PDF document text
    • http://plncse.hu/php_data/file/25824539158.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210906163740.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137760ccdafe---xafidabi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/21660785264.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345b0388be0---ketagegod.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/11871774129.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/xinadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+tv+os+updatePDF 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_off0000b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB829 16344 bytes
SHA-256: d264515bdaec348bd33846c5ae0468f19862b983d16c4c867b3cbc0fcec6f3da
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 10484 bytes
SHA-256: 9897f5bc89c0a18d1a2ed3612411c496dfbf80e6f79b1ede156ce4431deca394

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