Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dce9a71c39ab9e…

MALICIOUS

PDF

92.5 KB Created: 2021-08-02 18:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 044d33d1fba970eac626f0e707f7a93b SHA-1: bb5003e8b9706b87e192e70c8c073c58d03a5c97 SHA-256: 53dce9a71c39ab9ea6579022a3a6ef2b032870c2db11f666825f8a6d98e3dbc0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://vitanova-cattery.com/upload/file/tekepitapoxovivafupaj.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76401d8b8---23145400399.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/67f6a944bd8eb5a9e57cc23df8231e6a/59749707009.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a0ade1fd---22078805567.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/9413533967.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d78e66258---17220924502.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/vasozulaguzos.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/86719808084.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac432be27---ziwefujunivudoxubiwozu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3314425c---46677251648.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608007dba5570---73790322905.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/98102957584.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/gogewejeluwalunu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/xizuxubenokizobutulil.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/44183d2637383facf44011711c8b0f56/43735230777.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c0f12e49d096d2d5d3b505c2aca44d6a/nuvamuluxakexogig.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/moxivubudaripe.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vowogezumapuzulelewuka.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7f49db2c7---widiwotowo.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/pizawotitunipowofa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160860ee6265d0---1413685606.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/23163417013.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/12541579665.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/92965572772.pdfIn PDF document text
    • http://greenbrier101.com/userimages/80526818817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=realidades+2+cap%C3%ADtulo+3b+answers+page+65PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 18088 bytes
SHA-256: 9861df1f9de7f0cea34be5272ae202eab73107131f7eb469860db1b75111afb1
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 17948 bytes
SHA-256: 3b7753091da102aca209e3ac9ec20e2ec3a8438edaaa05b12821090b858234cd
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B9 11716 bytes
SHA-256: fa11f740bc93392c20354b3a95756f7e8488b860200aa58e9457e7f3e7991871

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