Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff03bd53fe37f69…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 12:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e9becb8c1b6d75b35ac1591b0d91abb9 SHA-1: 6ed64bee0a68a53f2cf22794a0978e1cdc04fb04 SHA-256: bff03bd53fe37f69c9a51a2442a13cb30d2ba8441123411fb1fe5c2d0efb1d61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://linlinline.biz/js/ckfinder/userfiles/files/74055497545.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a2c7fb33b378a10a21b4ca25a1ff7124/pomukonuwe.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/nokiribikon.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090602163473499.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zutagarozajagize.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/75849920582.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/xupelidapokazetegebexege.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/20360510406.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rapubezumamoxaluvukesupi.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210919042915.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/zumujomiwazezor.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/17372145172.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d15c7c49---79506241320.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/wemixi.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/69095540431.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/34698376957.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/dalugokejezesibuw.pdfIn PDF document text
    • https://anakmeong.com/contents/files/62408834738.pdfIn PDF document text
    • https://ferropula.hr/files/bixow.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda9ce33b---22789239214.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/19813268100.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/musotagujatag.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109031614333432.pdfIn PDF document text
    • http://retailcop.ca/files/renejapejubovazatu.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/daneko.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/rowivez.pdfIn PDF document text
    • http://hingliltd.com/userfiles/siferapotivavigejog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=serverless+mouse+premium+apkPDF 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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 17984 bytes
SHA-256: afad5efe15ed3fcc52ddf62aaeef803dfb35dafde0d042060574d092ccfe3449
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 10544 bytes
SHA-256: e14ceec30258d35d0aeee0f8a58ebfa969237d2e83327ba90ff717748d6a0eea

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