Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d5ca8ca6dcd998…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 07:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b3ea662d6ff5ea3649281793453dce6 SHA-1: fae8bb5231235646eee6bf269f71b17fede052d5 SHA-256: 33d5ca8ca6dcd998bdcf732dee68180f971a43a5a27f85c87789a679af2a27a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other potentially malicious URLs. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6509

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa152ded88d---vumiwinamolalel.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd970a3c56---fibalologajaj.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/mategomopebuxofuxafojel.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/1554042457.pdfIn PDF document text
    • https://baglab.pl/galeria/file/99391635447.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/98dfb53fbedd5d984e0169a0c005c3eb/14571958556.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/lewiruzuluvotebevefelewiv.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/kaset.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086070b0eed7---gemupuj.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/bipodegudesopurevudal.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/dowiroga.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63d7cb8f10---sazajafatukowuximenepam.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/28129771897.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pilatusibiremabiwifinirop.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9adad14dc1323d408c18e8c91c650510/kamadap.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/90759400167.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589080b313---24118212387.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/59353088020.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7d9hvtomksi7lo85rf69cirtae/wufujufomi.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/57273818805.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/52130142905.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/75274637893.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kitazemitiwanukupawani.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kadaxi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5010636506---milajaleke.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/jodoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=outsunny+greenhouse+manualPDF 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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10704 bytes
SHA-256: 540e2ea21105f3d16f906db8b805f646398938d13f8cec66b8803d3101453694
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 18688 bytes
SHA-256: 7e74eb665aadc222647a76638356fa4973d77db523f9b1d8ccbfeacd0ae18ee0