Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25be4bb533b6f97…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 11:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9819acd29cd3625d0fd64a9fcb46be86 SHA-1: 75c7ec4d518382a9b446823fcf538df9b2c1b37d SHA-256: e25be4bb533b6f974d060e1d11be9d30dcdf4af8569adab0857f71d3d7a96ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm directing to multiple websites, many of which are hosted on compromised WordPress installations, suggesting an attempt to lure users to malicious sites. The presence of numerous external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5a283c3c23eb80aea78a50bdff2fa2e1/89643046969.pdf In PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/86535264491.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/31662863170.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/75651436172.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/rikemusufezomowok.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/xedajosonejafotufopemele.pdfIn PDF document text
    • http://rts-3.ru/upload/files/tinunilubejubig.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/20021981559.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/64282472267.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/bikatuxikaporifoj.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/14342870266.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/52357580254.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///52132504564.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/wutumojepalifiluvuron.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/xijikofezumagi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2c169861a5786d13ad739e1276723ee2/68324937980.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/82633551766.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b740988b05---sewumemesukomuruv.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lupenisofebesup.pdfIn PDF document text
    • https://atlantidegattico.it/file/gizirokof.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/nenufuzenodibuba.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/56498892152.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15369999970.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833fdcbda7---24985959975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=armorfly+browser+downloadPDF link annotation
    • 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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 10648 bytes
SHA-256: 87d38a1e69ca6fc360836138cb3199ad5eda617ca7044c9889de6bb57098daba
font_01_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 16476 bytes
SHA-256: 1781a0e42950554d29fd170c746b3dfa5c6b3ef79a00b24aba4c7a3801452dff
font_02_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1