Malicious PDF — malware analysis report

Static analysis result for SHA-256 d439225b7c27c2d5…

MALICIOUS

PDF

99.7 KB Created: 2021-07-19 23:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b3a85c56002abbfc9e64ff5cd4687ed SHA-1: 2f5c1566c15a7e790269c804650eb7ce5d43f96d SHA-256: d439225b7c27c2d507b1fd3fe974adf63e0c57914816cd937bea112952045a03
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports the classification as a phishing or malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d19fbcc9e---99360079126.pdf In PDF document text
    • http://watthaistuttgart.de/userfiles/file/89279207535.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd2564299---ravafivazu.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/57966242434.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/dojetuxikuvur.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/heq61qn23n25u4o7asfipkg0om/3706023603.pdfIn PDF document text
    • http://attlas.center/userfiles/file/41225162882.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbcb2cf442---sukuvoxifufijizunek.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945a5f7bb0b---74687154127.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d5a5abf---figeforuvabolotifediwu.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/72906660407.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c27abd45---40974400584.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/daxopamazufetatasevo.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/36308636896.pdfIn PDF document text
    • http://amandamaitland.com/images/file/21406665715.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf133a77ad0---wafumoj.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/66f843c945f58db912e5a589ffd44de7/81654842285.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/71882708218.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d35cc763322---20098415765.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/datipuxapawojidaxi.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nilujisupisiwepo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/gopegufidamu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/462691047084c2b69e377567a7b52549/maneguwapazokobev.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1958999297ec82b8a9e091eabc5b64d7/814229769.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073741ac4eb2---7951279090.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wakafurenidukewaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+cost+auditPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 17588 bytes
SHA-256: 996db7110c3dd09785c3a9c78faab7a854761b972c5733cf72a1969e27d20d41
font_01_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 10540 bytes
SHA-256: b0e57a8376d582f94316bf50288fb942468a39ceaf6a401cfaf3a9af7c2d6a5c
font_02_sfnt_off00015256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A67 16392 bytes
SHA-256: ef0cc6e7d46b82340c5d611abc6d5ef62dfb31a25a64485243244449d36d16ea

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