Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef3eae68281264c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 15:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fcbaf7e2ec653c7b2d1921027b6ce62 SHA-1: 733f693fd87793fe7286b7605946adbb50bf0fae SHA-256: 8ef3eae68281264c88f0a0acd3727e182c50cda4e1ce1cb33a20de67c4027bc8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The primary URL suggests a lure for downloading free games, indicating a phishing or scam attempt. The embedded JavaScript likely facilitates the redirection or download process, contributing to the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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=download+free+roam+games+for+android PDF link annotation
    • http://girisimcilikproje.com/resimler/files/juvinuwejokosuzifirumagan.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/41974540052.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131041ab9d19---tivilusa.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1d4ffa70ad3fd0f714262d83f359fb6b/mexadarenufulafu.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/73423033580.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/vitiboxobajubu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/68951688153.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/53652221314.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210921204840.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/jujidu.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/nagexavefakuzaremodil.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381a0506b8e---61559157938.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/maxajal.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/73214315054.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c00b91be2f---waxudumopavomiduvevu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/55624874741.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/teranolosuxeji.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/36701288858.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/buvuzakagurakumibazirifot.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/lojowigu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sq3gg4uscq99q60frsea1ea03r/28548974496.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/41818987555.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/29063478465.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf13f36849---fipesekijiwavagebeb.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_off0000b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 10688 bytes
SHA-256: 8df44a6611c35717ddc087ed7f81018e41489c347bffc6ae9f4c4ac92cdbee18
font_02_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 14976 bytes
SHA-256: 2d1cd153e3ae3818ee9073bd4edbc290fcb1d76701b92bcbc2516bdbb2fe9e36

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