Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d45f797106c19f4…

MALICIOUS

PDF

92.3 KB Created: 2021-08-29 06:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 12a04b6cceeb2ca3f2ae9a8cedd85c3f SHA-1: d7c28f63af2472ea1017a7dfce6f77b0934fa407 SHA-256: 4d45f797106c19f4ba518f16924cef91e674244183100a3e1951dda7df620456
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://matras-matrasych96.ru/admin/ckfinder/userfiles/files/miburef.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/rovew.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/11020476497.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kuxegebepuxexenemuruwuza.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5474eeab0d---gagutupebu.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210614102152344.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/mikavonatiponesugosile.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/23662940743.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/57814020636.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f459ede383f---76752355706.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/5562826108.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7fnbpn2di5b7lv72l507oil7uk/tivenalebik.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/777335fb7670da915427691d85b44183/57974582812.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622767359.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/tukunojurowalewikikef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492179146d---54245946252.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/jorik.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/magitumenepidogaluz.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2ea6772e772b62b651c0e8bce75ff583/66876031579.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/57999645739.pdfIn PDF document text
    • http://hncastlecable.com/d/files/temirumo.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/kirisekomenut.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/dalizozaxojug.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bunibujegino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+scariest+movie+everPDF 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_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 10376 bytes
SHA-256: a4b30924d444f5cccb6c94fbec8e875bf2bc674b8e6eb55d80ef81febaa11ce8
font_01_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_02_sfnt_off00014bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.