Malicious PDF — malware analysis report

Static analysis result for SHA-256 38075c2d71128bd2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 07:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 548fd0a49c843684793d935c4bf88d28 SHA-1: 4305c718e1cac1366cd0b5b6fd37ee67eca0e87a SHA-256: 38075c2d71128bd2b4ac9fff21f64a272837baaf486ce1abff5d5ce9949a0e91
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. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://medvor.ru/uplcv?utm_term=reliable+project+cars PDF link annotation
    • https://unifor975.ca/userfiles/file/70810574992.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160730dabd52c6---kexomofutuwawarerez.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/82303995223.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/novaxiralejunozilefovuwi.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/doletinetekonugejizaj.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/riturewedo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/842ab40baf197be899dbfce3e16a06f9/66557749472.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4435b3e47b0b5575da53dd6f6c9fca5a/54436106151.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/kubivuzakejumumibipi.pdfIn PDF document text
    • http://ttc-investco.com/img/files/gitomuxalotigufixi.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210714/file/16262454881852.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/13223666915.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bezuguvadefawo.pdfIn PDF document text
    • https://andrejc.si/files/file/vukaluvoxokam.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/bozota.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/ziwotofonejazeraxed.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/buludagaf.pdfIn PDF document text
    • https://airbays.com/userfiles/file/31005237298.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/55405769577.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/rufarusisosazibezav.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/457f5dacb122cc65c8c5a708eeb6c197/87899128878.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fa0ba7ee6926e7410042bae0d8cde9d5/14039033305.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9147571861---malufidudovokuk.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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10576 bytes
SHA-256: 161bb4a90187b6aca79fe814c2e12aeb1b57712069c23965eaa2acba9188d2ff
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 17252 bytes
SHA-256: afba5ff44c4b90dc8306e405f79a99af41ffceda00e9f185c94f2312204d3b00

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