Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9dbf5ef853c38f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 16:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db4262ce9f3d0316e70ba14229083fd6 SHA-1: 7fd7b8632732bc4b8cea4eeac14840cd8764449b SHA-256: 2c9dbf5ef853c38f7853cd2e96d30be0da4430c34b648a0bccfc496e4155803b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics suggest a mechanism for delivering malicious content or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://chcial.ru/uplcv?utm_term=longman+preparation+course+for+the+toefl+ibt+test+3rd+edition+pdf PDF link annotation
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613842dbd8496---48728799068.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/ximegov.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/70353981382.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zulegigiberolaluwo.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/garebovawupokine.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/96739374631.pdfIn PDF document text
    • https://eventaipei.com/upload/files/wodegupafelazururupis.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/bosepidipo.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/kukosufejagopurevuduf.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133048fa97e7---kusedewuwinobipa.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030056296605.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/29706709374.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c2e043fb---82618664345.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/zezimozamizutobag.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/48416177955.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/mokekamekodimiwawesikijo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a7d29a6d7---3969148551.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488a6768ad---64248196634.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109071605401661.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/rumojiwuparokojewiwuf.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rokifapewakipikek.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/kuniwixad.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d2015e6d---sofogetamofunezij.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fopewusaperiwog.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_off0000c2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F1 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16984 bytes
SHA-256: 34aa106b6d0f7acbacbf100de15be8a6bf19be06c0f7180ff7aadbd75ad14bfa
font_03_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 11436 bytes
SHA-256: 9c30c1a29220dfebe1522bd873052f9975acf87d9537af662bd1d6e36f491247

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