Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd57c2bea5249a0d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-26 01:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a3c029f3a8c7f8d1166eedb65fcedb5 SHA-1: f67d0fc046a7fcdd9de4e92815d38dc4b4a4cc5a SHA-256: fd57c2bea5249a0dbd40ab36baff84e9ae2b7cad98095a41b7ff9ca54b9c21bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obfuscate the final destination or track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=household+items+that+start+with+g PDF link annotation
    • http://abwingsjanaf.com/uploads/files/lasugejowosofunok.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17dc8800e---mizozasigigadezutop.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/36472692264.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/65417997506.pdfIn PDF document text
    • http://saint-party.com/media/file/38592384150.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/65a3c87c22d0d9ff8e1000aad08cce52/55910468773.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kedowiwobojupegilejatum.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/28560479581.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/nigofab.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/be826af15d3fc5e906bbd32aa7200dd7/nunowijabuxixujo.pdfIn PDF document text
    • https://jin-ji.com/upload/files/32490676578.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/pirekapav.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96d0a5b95---39069433807.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/fanolofutomozewosiguzebav.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/28619907598.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/tovubefasufoxawumivedudom.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f016628a61d9a244646224703ec930f1/gefimezupe.pdfIn PDF document text
    • http://esipro.be/userfiles/file/2999290316.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68032965855.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/daxatozirebup.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/vemutoludotuki.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/59985380416.pdfIn PDF document text
    • https://electroagro.es/pub/files/zadovudusuvulujefam.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/vitefonepumimoru.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147674eaa700---83425131197.pdfIn PDF document text
    • 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_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 19888 bytes
SHA-256: 2f9766c0519ea30252e8645bff37a057f74c48f7ac0bff6fe5065f24439ffe71
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 10768 bytes
SHA-256: b6c68403dff6aecfbbcf8843ec5ff4743fce06ed33333135d2eccb1cdcf38b81

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