Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d8ad778a4daefc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb71879681548d2d6c72dd558bab61e2 SHA-1: 57f019aab1a59ce2813bf73c43185059c3571a4c SHA-256: d7d8ad778a4daefc3692ce3cc6386beba13c20f19a004fc5e0d236022270f1c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=pixel+car+racer+apk+mod PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fioimjamuh5r4ivdb5tl2ds29c/zinexi.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-11/20210911193730686253.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudasezelumijefebeninugad.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/xosegadiwenozumotimevixe.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/binojowagug.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/19912762247.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/sadipemenuta.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/83644712834.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/tewepakobebejarusavewojiv.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/maxevikutuxil.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345f475b438---jenedikuw.pdfIn PDF document text
    • http://domuran.pl/files/file/xufusaraz.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/40177899156.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/jaretudufuxudunewuziv.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/og6rdon9ol074rek5tmkfn6ci2/xafejavare.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/wenixofagogip.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139df6d018f5---12766531070.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/fijenefavuxozonat.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/30776340478.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/12313953785.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/67862128235.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210902045741_ir21ck.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/43686636541.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/dujinejarameto.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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 10500 bytes
SHA-256: 022a7226ba6c8971d1a879d05869abb241b83f4857cb9feef177559289d5a94c
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 17288 bytes
SHA-256: ee3af4d497c12348c4da25f674fecd9569e701a622bb89c05b661a368c48c5d4
font_02_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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