Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b37e13704544f6e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 15:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4bc7b0f350260087df6e83ea81c7afc SHA-1: 6863b5d762e4a0c88cbf9168a915b32af4a5e2be SHA-256: 4b37e13704544f6edf1caa1ab5576a4431d2434c45578a701368e6118db37ccf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=netgear+n150+extender+manual PDF link annotation
    • http://wienbildarchiv.com/upload_files/files/fenolofuvudas.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/185ba7eb875daf350d81b6d987891528/zudetavobijetidilovelura.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210905140713.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160859ec87ccc6---seniwepumilivodagogoluxiv.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/labilelevipenugukuve.pdfIn PDF document text
    • https://kermanrooz.com/img/files/76585167578.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/16342632752.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/64870241779.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210719013327.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/feromunev.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/07096922d5ac56a1d98bc55aab7a276c/wegukexabojedurufimafem.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/xinazawukime.pdfIn PDF document text
    • https://adikkedua.com/contents//files/78912948921.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/57864581096.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/xepelapo.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/vunizejepuz.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jatosawiratesa.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/geriw.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/nomeveperatixegejaluviwa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d09175095---waxixufesubejadaki.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/dixaleminivuwedemano.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/21266295266.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/tesefazumu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/48275395969.pdfIn PDF document text
    • 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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 16444 bytes
SHA-256: 0b3aa057df329c607c2dc3a9324675dd2b5bc90e0e89096574540d7fe685df4d
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10696 bytes
SHA-256: 18787eb303a895cedd8d9410ab4ecef7b29d54d83ee4f2c4539c2e0ad2918959
font_02_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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