Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdeab6c4f17e87d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 07:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e4fa5016cf4cb6692246478c3a10ad5 SHA-1: 589591d5221ccf6561b6f8523f260b3b580aae5d SHA-256: abdeab6c4f17e87d269ffca2ae4eddcda3bec1c4c5a15dfd3d573d1d77f8d780
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicates a link farm designed to obscure the final destination. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://studio70.eu/userfiles/files/71247608976.pdf In PDF document text
    • http://mindennapi.hu/upload/file/gazomal.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/xituzinemojipurevegonevo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5afa45ba5---41026581194.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/70549849020.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/5796672437.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/nowexu.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090318042973499.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xeloxejemezorigupajumogu.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/wovaxasulupison.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/43090326660.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9ee9dd874f1796eac12fd47bad49af0b/kagufabutoledepakobofojo.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/jadasodugibexis.pdfIn PDF document text
    • http://geasit.it/userfiles/files/sawixizubivejopelerow.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/97de8e6e427c6d6262314385a789a28f/79971372118.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/zodefuvomudenevikulisedup.pdfIn PDF document text
    • https://wittnebel.dk/file/47856925769.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/vurasapuz.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109101324308750.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/17167376967.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613879af61703---49570347154.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jewawakofapala.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be56c1af1e---dozigarilumawokotok.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/8349901776.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/74301384948.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/13453947962.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/gebun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=neo+geo+emulator+androidPDF 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_off0000b819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 15972 bytes
SHA-256: 51635a5f85051713c87e06b87313eac8e907f4315b60ea2a5e0142d43d557a83
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10500 bytes
SHA-256: fa82d95f4c363477b22e011d404666b4fa089ca6f5ced7a07b1df2772c05f07d

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