Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d151f83f75b6243…

MALICIOUS

PDF

80.6 KB Created: 2021-09-30 11:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b902bc9761d0a941a75afabf20c0c6f8 SHA-1: 72afd574ca1fa462f5dae94525ad41f768c224f8 SHA-256: 9d151f83f75b62439da2e950c42de88945c4d47138abeda974cfc9b537dfbf19
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 phishing or trojan payload. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm used for SEO poisoning or to redirect users to malicious content. The primary purpose appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=skype+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE PDF link annotation
    • http://kanchanaspa.com/ckfinder/userfiles/files/53629579209.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/69713517032.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/32192868271.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/14429930739.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146685d08eb8---fedesotevujotetemawanudub.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/2892987463.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/73268410146.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/76119509054.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/67406319558.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630618208.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/36749f641d552c5df4f6a385ec943934/64837072719.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2db83edf8d53ac4d9bbaec9dba0c590c/60303735832.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/41829081425.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/pulajez.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/64660534561.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/90381987768.pdfIn PDF document text
    • http://tano-cable.com/d/files/90204528637.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/45179566736.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/91669369638.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/gikugibepoduxo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/86456076495.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/48642201161.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/xumitakemaberoxani.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ufj1ilb9i1bl8f44i27udus804/modiwujozopik.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/zejodedolaviz.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zepibofowusoxajugi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A5 20456 bytes
SHA-256: f2702f15dddc56b25bc01e88f8953ddfe1beea2a25979d2c24d44bed7df21578
font_01_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 11324 bytes
SHA-256: c7973ef87cb621fb6adf1ae599a83513e5a98089abfa3635faea288c506fe9a8
font_03_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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