Malicious PDF — malware analysis report

Static analysis result for SHA-256 364f63f2acb9ec72…

MALICIOUS

PDF

88.5 KB Created: 2021-08-13 23:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19a3879b6954dca86ce64f5931726b49 SHA-1: aa835da82761ab8d6c05ab933bdef573e792f038 SHA-256: 364f63f2acb9ec72c51a4ffefd73efae47db4ffcd21f68d40233caad18677f3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further malware or leading users to malicious sites. The file's structure and numerous external links align with techniques used for SEO poisoning or directing traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c912ef787---55663149055.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/eu4uo8h9ovdulao26f9iiud4ig/xinalepisazudobijek.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/23312907565.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160f7241772871---lutawefujedi.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ca3765919155e9c8d9f5e79519ab0399/14845888763.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jso202m1af1gp2gjhjsp0mvv2h/25127715429.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/talufomen.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/89631386368.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d89e83dd1---somisipejuxusasawatoson.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d25b581e0a5---kifomumogobe.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608227d759739---laluzonotawiwe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160898b451deb7---61613637549.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b245f5ccc89da07aba38dcf00e20d4f3/55591083345.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/13468865526.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/turesidas.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/vovaxulap.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/sepegojejawug.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dc9b216aba3360cf8acef3ac1898136/23675298031.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b3d75374b000626cba5032e4c3365866.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/gimojiwe.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e0d031f86---wubokatepebikidejavamo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d35a917a2f---61085414757.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/98052684232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+online+bubble+shooting+games+to+play+nowPDF 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_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 11116 bytes
SHA-256: 7e5e10ae34dd08c67b2c6465f3f491c08c1afbc6ca13043c518f92e75c685b1e
font_01_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 17224 bytes
SHA-256: 3b575e8a14494c52033561cfbafd11bd0472f7ca7cfa5834ba06bb858587a5bc
font_02_sfnt_off00013a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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