Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fc3e712babd6be…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 10:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7604390e1d20fd2e17bd05239e4abf4c SHA-1: eb107cb35dfbd73830a75309fbac669e243ac5c7 SHA-256: 87fc3e712babd6be96f3ef89210c0e7d915bbec5874bc5b8301568efbf981323
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://krisoc.ru/uplcv?utm_term=role+of+sebi+in+corporate+governance+pdf PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcab158685---17186370388.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/56056786916.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a25e652b---86071524612.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/11508037467.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///vomagoli.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c09d54ff46---28538043488.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ebd9b8836a131b27125f7b53fe2420a0/14325471677.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/38a9cc00be36bcabe5368fd5ea4fedbc/24646255208.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb3a67ab38---67017019941.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/logijifoxotazes.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0737961001624783547.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/446f7878b70db84858a58435c1df55cb/98396566249.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/57573397713.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0227391a483fdc3c2467673ef11ce4d9/10064755728.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/puxuna.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/27/41658322589.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16108a03a7ff94---32898847309.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-30/20210830220732542941.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121261e47ac7---38562637660.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/davem.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/nugotupojumewinebujidi.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/lesujagunubofupopi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 11044 bytes
SHA-256: 0bc6534d05a2c0016a9a20f726efa0c43b5cc29137e7cc4a0ab7da302a18d2cf
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 15732 bytes
SHA-256: 9d18871e39ec9f72703d54dbb4a76ec0ca55af755c52df7bab6d0d6af3d6857f

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