Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e11394decfec0c4…

MALICIOUS

PDF

62.2 KB Created: 2021-09-01 15:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02b6920344a0a3018d422b38fc60b721 SHA-1: dd4f7aa23c97540a9a649100ff59f7aa1e0abede SHA-256: 3e11394decfec0c49adb057bca600a4ade3bd46c309381614f533431976aa9e4
154 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

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 http://biblioteka-belzec.pl/upload/files/nonakubojemeni.pdf In PDF document text
    • https://globalmediaminds.com/uploads/files/gonusozimofutebesume.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c784febeba2---18406380907.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ec54ff2e0b9e616b141f6838f59e0b8e/38460230964.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ed463636---xodek.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/516dd828790580e0460e77b373344cff/setujotewijesozefigad.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/pazuge.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622124286491801620.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca030df479f95f7b8cf8e4ad1bf2c55b/48032480620.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/24695011953.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb469245at8rm169hsa28gq0j4/91855269363.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/dakil.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/69481ad023f7417cefa6ead746258c11/4790445728.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2u5gmcv120s8ljv1ilg4ek46m4/xalapuwesitigaripu.pdfIn PDF document text
    • http://husplaza.hu/editor_up/wexukewebufuzefegotoxazif.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/f0rfd0nv4tvtscdms0nk75mq69/pilixujux.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607075d24d69f---maliretedepegukifomisoz.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/47471015063.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/02e50545472d68e0d4778043939e1240/vikefisovis.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/64890188069.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/7d8172a8d7d0747173f8fbfde4c7c7c7/vasazimupavelifekenojege.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dc66a46e---pozejelosukotuveneti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=quote+stars+in+the+skyPDF 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_off0000c33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 16640 bytes
SHA-256: e5c1b17b6bf96480411da567b1733670f758b2c1f88b8d60b9a190b64325d2f9