Malicious PDF — malware analysis report

Static analysis result for SHA-256 33906e300bd45a44…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 10:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0798f5ab835bda0fb94046c94c36455 SHA-1: bcc84efabd2d79aa831242ddf66d06bf3113a798 SHA-256: 33906e300bd45a4423dbceef0da9e4bbbc9338f60201d2f351aea568771ef7c2
162 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves as a lure to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6927

Heuristics 6

  • 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
  • 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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/28c62b5212e1d0420dab15e26b1221ae/205054530.pdf In PDF document text
    • http://musorcentrum.hu/files/article/file/jubujigelim.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/6n5s41i90takh9n3bobj934k96/60604585012.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/gevuvobasu.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/vudosoletowesiwupawesitax.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24ed36fcc---waxisenakali.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/21025877312.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/2kr8hbeubinqr53kbg31ac8n66/gexolipajodisipezo.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/9588033268.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/557678dcfd77d0c3b50bbe9c0a21e7ba/20482256089.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/661253286.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/729e7705cf8415d32e2bf103efb9fc52/33148699693.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/h1is7k1thnni1240tvnbnrh8hb/438376383.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/bonemitawozagudip.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/76b7a30ff3584c1e4f3e0f90581509a6/64987153156.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573f1537f4---xigusufakodenugina.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/ravunuvenubawo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/89a3779ee99bd9ea30846fec66b114ec/lawobewemafizogenanev.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a6ac70259e9759dc33926cb4731b100d/81905340459.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c6880885---31000697716.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/74925448841.pdfIn PDF document text
    • http://snsi.jp/image/news_file/41891253570.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4526d5e380---28181578659.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wujuvaxejifalida.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760eeb01049---xebafosiraku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=leafy+greens+for+toddlersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10508 bytes
SHA-256: 6dbc3f33bebf45174996b9d94218b716c5cf63f5274642e98e63635971ceb8b4
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off0001385a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385A 17296 bytes
SHA-256: 6990d1879e60c4b23245a03e9bff02fbfa4aa60396bc2c27a65ae2e0d793db36

Open this report in the interactive analyzer, or submit your own file for analysis.