Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b88158288d5dbe…

MALICIOUS

PDF

72.0 KB Created: 2021-08-02 08:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37824abf2f6e6df13eaedb164ef42658 SHA-1: 09a7ac83222c38f9c74817f8171435864c356638 SHA-256: e4b88158288d5dbe5a050236ad5c23584134bed6c1769c36e978909e566b96d1
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8786

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://wastran.ru/uplcv?utm_term=ejercicios+de+regla+de+tres+simple+y+compuesta+resueltos PDF link annotation
    • https://latework.cz/soubory/lopupowuja.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/osjt9ek3agcilirp9hd8p88hl4/wavesixa.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/88265973991.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/rapetanafub.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a89be501c01---83217607611.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gio21b0etavkemqd6g3m7ag90v/togevodogoletupija.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a5ec94d0e3f0be41761cb16a846f2b98/nezesabigedu.pdfIn PDF document text
    • https://olterus.com/contents//files/kutalunoxinizazodevisefa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a332f8b1b0---43505898369.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/96991593241.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6270ec2f0---28659847338.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/bejiriruvidelarele.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/kivuketozuzorurenif.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/24650867789.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/marijavupeju.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/168008622660edcde001850.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/10d84b8f6a613f3b9491e33c84aa1787/kibutoporuborexegi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hebrv3fbbv0223rrpv2e07lhiv/84528800014.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/ranejomijavilis.pdfIn PDF document text
    • http://ahchala.com/img/file/gebewebabuwusifetunutome.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/menewuxafivivuxufedu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/58771555927.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/zalinebixogaduko.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/419e9d99cc3ef698ecd25f036268c49e/pabifezigirefafin.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/71220214853.pdfIn PDF document text
    • 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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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