Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a4d090c1bb8ec3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 19:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b09739102af72e2e43881569e345321e SHA-1: 5d6fd81361de828418374d73e6f85737c727a33d SHA-256: 76a4d090c1bb8ec33e379b3791449e90d8e2f4dd3883c71966f196d4adeae08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bisenzia.it/userfiles/files/61008593840.pdf In PDF document text
    • https://nacituran.com/userfiles/file/73443622730.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/71559743700.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/3068129695.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/33678614143.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/90234901801.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/96491866423.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/1754261505.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137deb1c08f7---nudosikunadinatogugowud.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/74331956551.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fctmcap4i2aj66kuorgmi2l8uk/gelujativasidajemisonilev.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/45899413496.pdfIn PDF document text
    • http://qdjshg.com/files/file/bupokufetededafopojiwamo.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/tijumifuvilutaroborana.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/fuxogewizepewa.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210908021335_godrv1.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/radurenukanesukijazukaf.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0ipb7mhpqfo5snoiilugo2pifv/wanejajoxiwufaji.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_173132.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/wuviwanefirofoxino.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/24298483647.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/19319172791.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/pewaxumeritazipegegi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138190a54e11---54169824291.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/19431365980.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/32273990674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=6th+grade+math+printable+worksheetsPDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 16600 bytes
SHA-256: ad20cc642009e2681e07f7ab5ce643779a88ef1a0e718d13fd85221e592a6b08
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 11228 bytes
SHA-256: a9d2b05e1893450bcacfb8d66265adf3ec9ef9a905ff5741e7932f7bcc8242d2
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1