Malicious PDF — malware analysis report

Static analysis result for SHA-256 7037dd089e6e0d5f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 14:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e2248a4227055edb2773a455a448798 SHA-1: 56a16edf7ac58c7503a40c644e2a5adc4c66186d SHA-256: 7037dd089e6e0d5f2834c13a45b57494cd7bbc664d1b308d38251d5961eb5f08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised WordPress sites. Embedded JavaScript streams are also present, suggesting potential for further malicious actions like redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gpmpoolandspa.com/ckfinder/userfiles/files/maduloveferuju.pdf In PDF document text
    • https://mrdak.cc/uploadfile/files/18914943922.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/138199457.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/84260704b04a2d01a853e5905e30e0b8/xilizarukugofalugidizo.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/fojerubobezok.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131197f371a9---xovogaduxudufodejamur.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/wawajijigaxemugonoj.pdfIn PDF document text
    • https://tmtteks.com/files/10384882986.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/rakezesazebovaweti.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/90336179187.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/nepekefonanamib.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/69716912064.pdfIn PDF document text
    • http://104408017.linker.tw/files/xevopunobegu.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/49360106277.pdfIn PDF document text
    • https://123natura.com/stockages/files/84327241133.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/zaripikutetofemuwi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161400b241d148---3492517441.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/76958231019.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141d7c571e87---xomex.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/57231188254.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/72459192864.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fb84dfcb---55123507506.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/vavari.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/39865904093.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/96023566143.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2057b5e5b---kesepum.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/88489213173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=swf+viewer+androidPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/fevajuvopabizis.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_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 20452 bytes
SHA-256: 396143d29429ec3e0f3911e6b48ddd7b78a5645be854b230517e1951c54005c5
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 10260 bytes
SHA-256: 865153bebb7a35382eb54998434df3dfdbebdcf5833dac1c91e1659d769285f6

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