Malicious PDF — malware analysis report

Static analysis result for SHA-256 3723207689d71a07…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 15:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87d78ce977c4b719e0c91a0f934788f7 SHA-1: e8cc3e0261cf67ed34e32020581646051f930b03 SHA-256: 3723207689d71a07860323712b23f871305d479a641f50a359bfc68cbadb15e2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. The primary attack pattern involves tricking the user into downloading a payload hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7826d1d14---69489173930.pdf In PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/kafazabisariduriz.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/komokelomivarotaju.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/29831143694.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e25206e1f---xekafawofesifona.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/42580763548.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/73e0882816859909bb15ad69f7d45c7e/90237076900.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/62139023193.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d9e8fba7a213e6a0ccf34f9db397725f/54661792485.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/romux.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/45519196846.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/givewixulusen.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/df4tnecrehjiijkruq4361abus/lotuzegovaw.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b540f2412b6afce0b6eb50206bb9c648/53932073862.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fojutorowojagobukibe.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764914f1560---49136595489.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/17035204857.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/pononanotolevubu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zebanatezuwax.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/nifibepovenikobiso.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/4742186907.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/xigakube.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kd36cu5n3n1ti65m4hiilj9n00/44200294745.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/putagezovedoladosapi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/94f63720464eb2f359c35276fb712b4c/tevonabimepesalabegoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=screenplay+format+guide+pdfPDF 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_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 18132 bytes
SHA-256: ef3050baac1f56361d0a2212e289446abe8df90dc1692ddb690c76e3e247a28b
font_02_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 11084 bytes
SHA-256: c519eda04bea39ee6b63ba5e108a0f777c445ec5eb4832228bbff968e4baa1a0

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