Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e2b64a538c7daf…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 08:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66cca4aa02bbddcb67cc7d069f07f8da SHA-1: 108fff9ed818cf8f2fa7a40abd31640f48131ef6 SHA-256: 35e2b64a538c7daf8e9abb04a1a1559ffe40b76e840ba02180798418dc3934dd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress installations, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/26cad1578fb5702cf15e7121a17edc79/54249823649.pdf In PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/43795277810.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/jegogix.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/sijesagisidibogetupi.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/83873278825.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/jakapaxinitakogoxugenelo.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/51448499606.pdfIn PDF document text
    • http://dogable.de/userfiles/file/92343934502.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b0ab76165d8972658a5cdba8111207e7/ladizatuletekovokujed.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613277a3507d8---dawefibajozudizuv.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/18052465019.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/67949599579.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a503803f---lilidesilutazakifefiv.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/wiwefasozofinepotorib.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jivivukegojarumufali.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/58406359602.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/5540071903.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/13387876639.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/bakupabu.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/83248535607.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/43261349661.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pujebalote.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/28822316973.pdfIn PDF document text
    • http://12shio5.com/contents/files/sedet.pdfIn PDF document text
    • https://nexapos.com/upload/files/23298977476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=piano+chord+apkPDF 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_off0000bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 16432 bytes
SHA-256: 1c1b4c7c9ffc7a9596d0a232caf9ada38a41286ef07bfa6a82fb9585a943b9fb
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 10260 bytes
SHA-256: ee9cfaeb8ebb8c6563fb27323e922e97f7064ff04b5a9a6af3bb0160058c8bbd

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