Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa0e4604abfff75…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 09:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7eceaf2e51cd75ee1f3183d4996a50de SHA-1: e10d3d6b4611a2427abb54768ef53705e12c07e9 SHA-256: 8fa0e4604abfff75f35416d55814f215f74f353b97cfbc64b43497d7d8884c30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The presence of JavaScript and numerous external links suggests an attempt to redirect the user to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://mantyobras.com/userfiles/file/ziwukifevowuteteduge.pdf In PDF document text
    • http://vuoncotichdep.com/upload/files/bavibepiwobuxefaje.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/babugaminasuzor.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/jilidejiwuravane.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/18013862782.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/92205696468.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/goxerisilida.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/ferifase.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/paridaw.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/99757135087.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xalimanodin.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/476405061.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/vepuwonoguga.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161338a0cd8528---7599785420.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zejizekutipogegeno.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/89489737604.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/rijovimosikenixok.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/11832047602.pdfIn PDF document text
    • https://parkettworld.com/upload/files/27018080497.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210919063148_1031524441.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fadazipivuwoboxasul.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ace444d51---muwumedaridiruzemosu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a88e6a72---wepokatisonelasexaroz.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/7179281431.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26033335021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+ms+office+for+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_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 10644 bytes
SHA-256: 53aa5eb2926d8fdeb1a9f5881f75480d7520501d9203c6d9adcbb274bfb486ac
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16532 bytes
SHA-256: 7234c001d567d2d856ab1d03796a45a0ab5417cdf08c8f7df9829fa9ecf6e222
font_02_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1