Malicious PDF — malware analysis report

Static analysis result for SHA-256 16489db71a77eeda…

MALICIOUS

PDF

90.5 KB Created: 2021-09-06 08:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31fac9f5ef6a7373eb8aa5f45a037257 SHA-1: 985454a043e77d4ded50d6e04fc3d91b0c372c78 SHA-256: 16489db71a77eedaca059dd7e0c3cb7c74c3d40bb287826240f31a428fc7f4fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous compromised CMS upload locations and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the nature of the hosting indicate a coordinated effort to host malicious files or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://c2ctrading.org/cms_upload/files/57063132556.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10e1a58b4d---mubofomunulatitasivotodo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/06a3b4aedae6cc439dc74c2ee008ea35/68223074134.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/pixakujexawe.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/sasoperanededefa.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16234808333412.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d9fcd733---pevuwijabekugegubefunazeb.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/52708717045.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/cc57bf8b8779fcc25d0d23a00c4da998/rovofilij.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/toxopug.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/liwekisizupew.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/nojabizi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4151b6a08a0a6eea4cb2292454eaa671/tivonejeromiminujuvuz.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/81306702361.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/57731763866.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/64724513814.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/sumuden.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/snaui2gmo010fvp2l6icn1a6mq/35692419717.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16121ab557bc9d---71917902727.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f02b20ed---51632728668.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4877065ac6cf7757cf0e663fdf038987/10057361477.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/milodado.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/rigamipiwagogotowasadudu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4636c67b883d18cd23cfab5792db8978/gekezuxivawalaxuwanubon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=czerny+piano+book+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_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 10616 bytes
SHA-256: 8e13be47d884bdc88e27a4e39cb924078a24db2a0c799f22850b36a8bcd6c6de
font_01_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 20320 bytes
SHA-256: 6b6ca7941c7934e6c88f4a89d0d6fd129f8f1df5a2305bac7e319869efd9547f
font_02_sfnt_off000144ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1