Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57a25ded8f0cf5a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-30 17:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2591b812ca8a977b42bc98fae483389d SHA-1: aa61066297fc5622a6ce7f998d44a14aefebda70 SHA-256: c57a25ded8f0cf5a81313b34e8f5cbe44b343e4bb6194e0678966089a1c68f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malware or phishing content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/346db5c66c3cbdbf4f67a6e1b6b0dd11/gokojep.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/81750414008.pdfIn PDF document text
    • http://iworking.vn/uploads/files/wuxorixusobixubebefi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae15ab43a---99360714369.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vijefakojoxetojenig.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/88461531879.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/dabifetixomopur.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c468660ab09---semusituxen.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/7407898804.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11e30525c---73401080858.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/nogi8cb4clvcqirc00hseaggj3/kejiromufuwubifoguxi.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nitamuwezuteg.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/78146381753.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/kavologejodid.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/wokepazafovexugidavawu.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/rusedevenifibuvupon.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kelejamepamijeruzirubaf.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c1194647585b66e8741cb5ff239c9f68/85562784858.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/840221440.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/jijepevemosakogaj.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e85262b4---nuzurafo.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/87215925002.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/59760428724.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/14793695277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=el+pianista+pel%C3%ADcula+completa+en+castellano+gratisPDF 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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 10864 bytes
SHA-256: 9db8fca9243197f509531c76f1a97c5cf4d9b4d504ad293c25539d2656ca1f05
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 17572 bytes
SHA-256: 880e9f2d865c82c20b1387c71fb78ef70b6f100c357c926211f4929e49d2118e

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