Malicious PDF — malware analysis report

Static analysis result for SHA-256 138b43a993f44c25…

MALICIOUS

PDF

82.5 KB Created: 2021-08-26 08:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e88554b5df4de38418d911fd71b9f30 SHA-1: 0b60930f1f35d6d460062402399fb4498c728f43 SHA-256: 138b43a993f44c257ac1e2c4ae7c64e4dbabb5c9a1228a8d9094ece44b8fe3dc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of multiple external URIs and compromised CMS upload links strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bmom6eah4pead4v8ojjg1fice1/58024513676.pdf In PDF document text
    • http://udmvdpo.ru/images/files/mabimivomexogogogena.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/45425565496.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/mamazuxep.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5d6o6pq8b5fbkr4ivefidtc8r9/13183168713.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/32443639115.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/10275594387.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/12860643510.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jijitelapitaraxixu.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/lezewivomegol.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/53956420369.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/4b22d5f9f730ca4f999a98511d86f83e/jumotazezodor.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/patelukiluxedazunitip.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/najolotuwaroludi.pdfIn PDF document text
    • http://yoron.net/up/files/zelimevodajobulawejuju.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/86971413233.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ponin.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/xugelide.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1ec6ffa8---39666842886.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/luxorefisugita.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/fulamotareje.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210707030558.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xovejopom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=birthday+wish+for+big+brotherPDF 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_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10876 bytes
SHA-256: 51346a1f370956a7512145d59434153a03ada8c899a07dedb4fe9d0195b56999
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16508 bytes
SHA-256: fc08001099c50a5e45ab69179bf5c4b88da38401ec2eba8537dd6351991cd4f0

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