Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e37c49dca33ec2…

MALICIOUS

PDF

104.0 KB Created: 2021-08-29 16:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 76398d47c691e6c7670ae097bb57e42d SHA-1: 2e22a8ecb9582eee48562f3d1842e23254a60bf1 SHA-256: 77e37c49dca33ec2f9961216a9e195acd2bcfecb14f4ba2718d2bd91f6ae2de0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://studiotecnicolamanna.com/userfiles/files/widarilaloxoxego.pdf In PDF document text
    • http://fautographie.org/images/userfiles/files/salolewuteritakutud.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/96800339793.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/pezokegav.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/102704f3ddb7f3c7945ac95be41b0b81/napixebetoliwofarudu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d36ae6464a---wolimonelonited.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/82509648831.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/84756292886.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/pojuzesoligo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/r5e6fr7rf924uhgi3kficprte3/90975286767.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612af61829c5a---ditasilimuvafufijube.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/39180108698.pdfIn PDF document text
    • http://holzbau-napetschnig.at/89668920335.pdfIn PDF document text
    • http://cmtsport.com/pliki/womupiwojimuxoliseb.pdfIn PDF document text
    • https://kopari.hu/files/file/savumosajelifav.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa3d1f1a3---fiwepibugapalo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5f3285131757d0988723093a7ecb83d1/memigotugizugenibabo.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/tarazakiresekexuzutuge.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/talutupozav.pdfIn PDF document text
    • http://rideco.hu/upload/file/60855340590.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf797ebaedb---nexuzirezogumefibi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/mojenivanimevofiwunowujaw.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/watemenasibasujilufoda.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9bc853a9---garazaf.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4361157db6---kavibalujowovurinaresofat.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/tlaibvdfe2kfadbed2f8jbqhfk/kulatavulinazagababeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=insulin+by+sliding+scalePDF 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://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_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 18272 bytes
SHA-256: 0e6717c82b53754abd79daf7c7ad5784d29780c920cd50d7ccbacf77b90f0ceb
font_02_sfnt_off00014d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D52 19144 bytes
SHA-256: c487f6e2714d8ee45622ddf36cc34d5316cf71b4340e62573ba77e002cf301a5
font_03_sfnt_off00017ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ED6 10532 bytes
SHA-256: 559a57e4233ab45b345e3cc3879444c3dea4dca63e0bf0669907bd7c242a6fe0

Open this report in the interactive analyzer, or submit your own file for analysis.