Malicious PDF — malware analysis report

Static analysis result for SHA-256 198c88eab003b6b2…

MALICIOUS

PDF

87.7 KB Created: 2021-08-10 00:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78bb6ff1c947ac1f8e391dbf583644cc SHA-1: dc13ab507b15a1228fde2c22ce5a98d2d4d517e8 SHA-256: 198c88eab003b6b23fb8276f654e1480910b6124312d41426211fae5e457ec73
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b272e96b---57371872797.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/cf716a54206e19b22a63648045ba53d6/zibowi.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081020e8c162---21028828129.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n6n7cld3hj3s95qh1tqsuik0h7/rajerokiwenodozinuv.pdf
    • http://enewind.com/pliki/file/16860065956.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d72d63537---natiragagerizikitiwimob.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/88019710564.pdf
    • http://rolmech-strzelno.pl/Upload/file/zakafomaluxik.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608032768d640---9529833017.pdf
    • https://arvikabc.com/images/uploadedimages/file/xirisegidava.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/88202341704.pdf
    • http://paroissedementon.fr/upload/files/15674881224.pdf
    • http://paillasse.hu/userfiles/file/fugakizepudenijitugubezep.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b7af49af6---55424215259.pdf
    • http://iworking.vn/uploads/files/kediza.pdf
    • http://etpatatietpatata.com/userfiles/files/lulepabem.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710c0ed9476---kutabeworateduf.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/68343498546.pdf
    • https://quangcaowebsite.vn/uploads/files/73984845938.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/65280377844.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e58ce7996---kobezobasubabadigodulujig.pdf
    • http://vititanon.com/user_img/files/20970248281.pdf
    • https://ascinfratech.com/clientprojects/trading/file/kiwomadorojowepofidut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+tales+of+beedle+the+bard+free+online+book
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f275.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 16792 bytes
font_01_sfnt_off00010a87.bin
3fbfa399c56dbcbb5eae5ff0372ace059511bdcee023a1eae7bebd3ea0f3e79e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16836 bytes
font_02_sfnt_off00013629.bin
5058d1624564cae55e0e8ce7e5e38a722150743526bf01231ba4e60a5c9cdd22
pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 10644 bytes