Malicious PDF — malware analysis report

Static analysis result for SHA-256 9992f3cf36fd1a29…

MALICIOUS

PDF

80.5 KB Created: 2021-10-11 07:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f547739f06858adae1c9575b9a62953 SHA-1: 6698cf29f1b174f1e09ecdf3d7863f99a85ca141 SHA-256: 9992f3cf36fd1a29d8ab886822a7e09849cbd3fdd01fb4e789ac3601e86573de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6870

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/cb2s5404paptq81d3se11gmcmi/8997721226.pdf In PDF document text
    • http://dar-tom.pl/userfiles/file/5190341807.pdfIn PDF document text
    • http://airserbia2009.vs.rs/multimedia/file/rasonenorifupija.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/81915993379.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/geteradoworuvagapopijonu.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/suzejusonabinelitamegot.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/10474646440.pdfIn PDF document text
    • http://envigest.cz/upload/file/zafuzipoxumowaripum.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161453ff0cf0bc---luneburadi.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/depug.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/pemoli.pdfIn PDF document text
    • http://rpelektromont.cz/admin/obrazky/file/roretakoposilozararosaj.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/80630370237.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbb3d3edd4---fefasanewogerewupoto.pdfIn PDF document text
    • http://ccshecea.org/upload/files/68181065662.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/tasetowuzapababugoxipa.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/37909933392.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/zapuxuxazulixaka.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/rilalutawulafilabokofas.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/xufagunuji.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d95a253924396aa9292ce55a87c82310/81669508506.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631959870.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/xeviloxubikefotube.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/80683509936.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161316fdf448ce---kobixunojuragokawom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lord+of+the+flies+ralph+analysisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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