Malicious PDF — malware analysis report

Static analysis result for SHA-256 c153ede0e2e86abb…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 07:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d3c344eaa90eece764190505461c16b SHA-1: f23a85e9855a8b3acee78b524748f260a7ef3d44 SHA-256: c153ede0e2e86abb17aa4d7f76ba751532b5c95720b721145819f729d2457936
146 Risk Score

Malware Insights

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

The PDF file contains multiple links pointing to potentially compromised websites, including one directly linking to a PDF hosted on a WordPress upload directory. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3127

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd024de2f---pedoxavesefatuwovijuwu.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/rekuzoputetugodusem.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/buvodokelepuban.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa89921c4a---17667653088.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ajm3p525q5hd9l9mgb3v3lmcp2/33170309402.pdfIn PDF document text
    • https://motecx.com/images/file/31891983516.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/28691851372.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/79764191055.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/zoxinepulazujovumi.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/79197518103.pdfIn PDF document text
    • https://camelcarpet.org/d/files/87774735465.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3ed4c5d0c---8680587463.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/71795151237.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/41438611874.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/gonigebupufeseso.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/1630023474.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/7327518632.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/9241457026.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/nekudizab.pdfPDF link annotation
    • http://studioarchterreni.it/userfiles/files/56510912243.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bd8f0d35a4204a5bdd7abb9369a3ecc9/bewodidototaxu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vakawumawovimukugade.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/lifediwe.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/93469157083.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/naguzetoxuxenut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=apk+downloading+sitesPDF link annotation
    • 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_off0000b31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 10628 bytes
SHA-256: b66428326c5e1433b05fe374c8197f0c63684865a1230486ffc87ad5fa93fe9c
font_02_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 17608 bytes
SHA-256: 4d920cd4cf8c53ff8bf868f16c08cac36dd8592dada8686498ac92746677435b