Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa74a75a79a6156…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 00:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 23370f7737082f5fe5469d5ece5a8e49 SHA-1: d6a9452bbf5eea0042f7c9e8c471223516090d52 SHA-256: 4aa74a75a79a6156bdbe0d6fdf9b4151c27cfbbce06a9f9dc17802d3800bac2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure technique, presenting an image to the user while hiding a clickable link. This PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/887ad8ec4e4b52673b6ba10c336f769c/99177858255.pdf In PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/15921266739.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/dti2dqa4gcb1a7lrj8gkhtdkap/10313456269.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/fazitepiwaraf.pdfIn PDF document text
    • http://poultech.net/d/files/26884665244.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c5304e088df6c141a07c5d4fc9f4ce52/domogop.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e32fceb54015161d7c6d3eaf88124dd2/36413532627.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/doxuxagetutaledavibe.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f1399ee91---jagarosovodo.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/13482346512.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/34378135798.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/61812224148.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/bekerijerawedabuvagipew.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc8e6f838---97382547289.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/2578921128.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127fe22b25b1---82654036299.pdfPDF link annotation
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/pegabigevul.pdfIn PDF document text
    • https://dhesient.com/media/65349622474.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3fbef86ff50b39a65ab07388a254948b/1843314265.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161010a38c1337---51301053346.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89887488332.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210704114127.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/81317045071.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a621d7a9b5dc6891f1486148a9cda862/wawokataka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=area+of+trapezoids+and+parallelograms+worksheet+answersPDF 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_off0000b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB668 11164 bytes
SHA-256: 44e11ab1c54ada5dec9d1f3093bc59e6fe7f3fc5b31fc8fa6fbbc180c524d487
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 14096 bytes
SHA-256: 6ad8db205095332574b0202a85c0e6591563d62f44e6a0c2120a2a8217080b5b

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