Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa5f30c3710378…

MALICIOUS

PDF

72.0 KB Created: 2021-08-16 13:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cfe578b2dcc95dd8cbd34920a07f0692 SHA-1: 343b1879236950f7d349b7fcd044bd669247803d SHA-256: 83fa5f30c37103783d16271001e78dc3ab30b5866e8006de84b1101c55ceafbe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5548

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=tirinha+com+ora%C3%A7%C3%A3o+subordinada+adjetiva+explicativa PDF link annotation
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839669818c---vokekakulolunokepi.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/11615352740.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e58924ccf---85981487439.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/xifiwulag.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/83108392144.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/wiseretokinuwokureputi.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/rulupetokajusesepejujow.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23413098320.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fijabibenaperex.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lelolibuzadederepefi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/71976395082.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a8cdf773---79370417175.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/zafodilejowupipava.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/91184818482.pdfIn PDF document text
    • http://allasclub.com/campannas/file/fugolenidetoxa.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/debavakavikejikapa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866957f36a7---1300190635.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/18667a47fbb7b58f808f60a9458673c6/tufuvej.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076616d7872b---fepiguvubelapivotodigub.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/80705395290.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f59a4eb4---44337377706.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/lh4ukrtos8pb39gee26p6sm8m9/jekadaduvorekefelujutu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a2c33e9f---fujefuvigido.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/50921822178.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g9l81mvupe3e06b5sqaiaseahd/silowufarozu.pdfIn PDF document text
    • http://rld-carbon.ru/file/dafipolijibizivokad.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/48265270332.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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 11744 bytes
SHA-256: d23f9f3fd56eb7fb6a7c59f7c02cd80ef232ba98a7b1cd9a99e731b6b445d09d