Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf7e51758b933a3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 13:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3064cd415307cbbedaa234151e91eb47 SHA-1: 9fbb2290d6780c1a748d01f495e0c41bbb0e0eb3 SHA-256: 7cf7e51758b933a33950c4362c28efcc133a16406ddd576a734014b1f32ad090
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user interactions with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://archism.ru/uplcv?utm_term=all+units+of+computer+memory PDF link annotation
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/napubugizosat.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/75305582991.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/25916165394.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/35749062836.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/navaviwaso.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/84488668047.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133453931e98---jekenodiwe.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/13092615460.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/sesujo.pdfIn PDF document text
    • https://alkoplast.rs/files/remeson.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/163139560347.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rudnmrb09tgphihj59e76n0sh4/nizefupuribelu.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/49679227044.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/gemoxaxejebali.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/vonabuwabugubezef.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/61449454310.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/75277201958.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/35afd2d2f9e1ac4c03b7bff9460b5910/juzanozorarivirew.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/57744822343.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139690fa3f61---nogofo.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/jimukerolozupogamo.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/43496297551.pdfIn PDF document text
    • http://gptools.net/userfiles/file/14645942123.pdfIn PDF document text
    • http://rrarental.org/upload/file/jatadagagipiso.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/56920068749.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10672 bytes
SHA-256: 755c150c425b45f4ebeeb6bdc923809d9dbd24bc6eae613c15eb7ba8cb6d16db
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16904 bytes
SHA-256: efb4139f7cc11af798b384cc479820468f9ab84d9819e73202467633545a6582

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