Malicious PDF — malware analysis report

Static analysis result for SHA-256 812fda1f3b0e2139…

MALICIOUS

PDF

104.7 KB Created: 2021-06-26 20:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 479669358478c871bcfc86dce0f33eb9 SHA-1: dae74a6e05adc7ba343293feef98ff02f5706485 SHA-256: 812fda1f3b0e21393225965a284b9866a11ecf45d902187915f9f1a7d94ab285
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. This pattern is commonly used for phishing or to distribute further malware, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8b53f9b33d1a68e1d7d3580e5751a428/suxoxusanobativuva.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa3412918a---11664318780.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a8e31f79---22776406842.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/kamivitozoxexaviwozowukud.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/benadumefejikubawike.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ae12d61db9e9d4860bdcfe965398b076/72172422328.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/suweleruzedunaxisasog.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5037f119b8---81975114883.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/67ccda0963c64676d60a9d51ee1aca94/mofogiboraxuz.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e861311df---likivavetinojirak.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e87e9c92---xudugulas.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b5cc388a---sazitetaximemovezizorav.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/001eebcab2563784fe0deb1b9b4f06df/4195551280.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/soi7t3h5jtqrtdcendf4iap0u5/89189672618.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16486941e4---18071270472.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/wonemofukomezazase.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lb3bfmn2gpa59j5s47cmp29i4g/76453377946.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d08af28e---96563942647.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/finaketazixubi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/36071393720.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/94583335895.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8ac35a632790218bfd46f132f39699b5/juwawewaw.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/198513185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=history+of+second+language+acquisitionPDF 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_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C28 11000 bytes
SHA-256: dc0b821c80f4de3987401dcd351fa1a7f31df5da856d41f0c11576f99b0c684b
font_02_sfnt_off00016556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16556 19184 bytes
SHA-256: 0ad532b59b4dad6dc0d12b57c52901b2fdaddb80144ee31b7740c2371f4fb1f3

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