Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fc13a97f181f37…

MALICIOUS

PDF

69.5 KB Created: 2021-09-09 14:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30b4d82e7de911904c7e1cb629cc2fd8 SHA-1: c7a21675526014646cc4f0b1120a833f96dfd40a SHA-256: d3fc13a97f181f3792bda87e10b717d8a300a2c40e46e374d70059a31886f4a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=idle+miner+tycoon+hack+ios PDF link annotation
    • https://tsolisp.com/files/file/80598161736.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69967d997ecb29f2d1eae5d6841b0c96/36969480254.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d13bd37bdbde87e66c61ec6b024a41c7/bedijopufazarifirotela.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/14072940837.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/ruveg.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/47853776241.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/robepojoduxamad.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/musalumev.pdfIn PDF document text
    • http://feg.vn/uploads/files/76082350650.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/xabolaviselibizowex.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/89400661835.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/90208337598.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/jozefatuweturisezet.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/58443045329.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/69695957679.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/xozogenakomete.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/60087388547.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/68971022474.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/29901696609.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133823d8746d---714508763.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/17662254021.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/ludowajokoxaxazanexar.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_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 10792 bytes
SHA-256: e09efccbd720779ac7e999bf0cfec1d3f6299b52fa6655e8ec210a38401de9cd
font_01_sfnt_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 15340 bytes
SHA-256: 69c6770d0edc5c461681a2596b084dce9f2a39388c0eb4a44dee6a84f9a4317c
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1