Malicious PDF — malware analysis report

Static analysis result for SHA-256 52178639d3805df0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 07:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6c24964d13717d7786c25b45ce5314c SHA-1: 8d29f5a5f7c4dbede5ddf95e9c162c9c4f616c46 SHA-256: 52178639d3805df0e882bd952d22b1fa66759b35813770df00cc96b29eb6bf0e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other unknown hosts, suggesting a phishing or malware distribution lure. The PDF structure itself is heavily obfuscated, and the document body is unreadable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea88de9f8---wevabixafeper.pdf In PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/misitoxufot.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/36054018498.pdfIn PDF document text
    • http://haki.vn/uploads/files/65579305001.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/wosenekeduxopefejilusofu.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/71325824506.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/83542315759.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf99b34b04---foliwesijofuvedojibasi.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210909_69622BA7B7F44EF7.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/dogilarefekunajixugodix.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/vewobowisaw.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/bikusukezutizorivovar.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6jnhnhbu2rs7ogccqcmsm6g7a4/vixirijopumabaneviziri.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/49083469873.pdfIn PDF document text
    • https://producto.works/userfiles/file/gaxofuniwobemexeramijoko.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/terugeluxamefalitiwa.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/revemalurozexabebok.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/delexijojowuzonegomuxama.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/43429846205.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gupudoxitenuvogobi.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/sibetijenodalevuxanor.pdfIn PDF document text
    • http://e-sheremet.com/img/51713795739.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161384c4e69211---69919812674.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/bunuzomukidafo.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/93489452145.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/25307078639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sonsuz+nur+1+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/nepoke.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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 20948 bytes
SHA-256: 814922543476cf60346c80339ffda43524985be190b299ceae6832427b952478
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10248 bytes
SHA-256: 3da3d346a423789edacca6f84918195a6ff79488a9cf370af6f2d9d97f8122ec
font_02_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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