Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f30bf8dadd5c3a4…

MALICIOUS

PDF

76.0 KB Created: 2021-07-01 00:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3b9da89b0b446204c0667af7e10df348 SHA-1: 564b0bf3a30f3fbaf6a5c704baac855a340da64e SHA-256: 7f30bf8dadd5c3a48ec3a2d0e2c92a366d3fb28fb97bb34ef6845dc511ecb93c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c632812c69e744b1aac14b9c8c0fe0aa/tafofifujeximoz.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733f0388f5e---lowerina.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/jisoraninewapozuvi.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/21666448046.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2d16b2e55c7f84d6d940b2ffd2044a86/99597235279.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/um6uqgdfndpskl546ajba4r76s/59770465547.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/6853599089.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a716954786e---palonelavurinagivasubixe.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/6914377070.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e006dabe22---72337022067.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fcc2b8870---94552375758.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/woxesekufu.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/57002180597.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/68701994553.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becdae802a3---dolawenizutifatipi.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/23205603965.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/96013716808.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xumilepu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/28b18ad9a05c30b6bf0fa517a6c62092/favosizusitenetaxap.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077637e740e1---83717326500.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mmb57ig4k15p03jspuntnec5cj/8540191263.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/75cdb7196fc345211780094ca53b2356/zewoxudufeluloselagaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=icarus+and+the+sun+full+comicPDF 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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 17304 bytes
SHA-256: e859cf4a03ee7cf9366fff480e7af22da00b9e2444d32567d112a516e69fb13a
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10792 bytes
SHA-256: 48188c12e018e1c899cf909813a8fc1067a82bf45f74db57718f7f1b8b6edcd9
font_02_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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