Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fe992e66b46186…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 13:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f59aa1c41cdb341c9a5c61106c51770 SHA-1: b2a67c40ba83f7b526302cfed38876fcc305d304 SHA-256: 27fe992e66b46186def51b8a2108e0f5cdd94f087e6474fee5493c4ba88cdc00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute malicious files. The presence of embedded URLs and a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed0092a78---mugozixaka.pdf In PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/zepiluwasopawudevugoxa.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79770606517.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/betaxevizi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ku2ltjlhbnbb3lf75fpcjaa0b4/10804444613.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zagusewo.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/41305322370.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/88150633821.pdfIn PDF document text
    • https://labelmarket.eu/data/file/78090464409.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/lojilolimidureked.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/tuzedural.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/gopifupimigegixix.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210912212230_1165422255.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/51744482771.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/nitawelewe.pdfIn PDF document text
    • http://hrudolf.com/userfiles/78125775201.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/pogetip.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///82461562477.pdfIn PDF document text
    • http://hodori247.com/uploads/files/zokege.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/kagota.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eae98130a---47983951539.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/sotebutepewo.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/tulixidapasewaxotifalej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brothers+movie+download+in+tamilrockersPDF 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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 18196 bytes
SHA-256: 4a98ce54118d81ffe2373b43aca1224d41007d97e19cdb19875e8d5c88a65825
font_01_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 10932 bytes
SHA-256: 5eca88cf0a5a35bb711f61ce80e9ce300b0ca12978847bc8d69126e730cfeafc