Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4286663e804c847…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 18:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cc61a90e761fd2be4238cab93b57aaa SHA-1: ccd4fcb41a3e42631e060bd811054748eaff5c49 SHA-256: e4286663e804c847cb27aec5cd91616dd26c16b3d86e9ad482a1fbc75a883e63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URLs, including those hosted on compromised CMS platforms, strongly indicates malicious intent. The ClamAV detection and ML classifier further support this, pointing towards a phishing or malware distribution scheme. The document likely serves as a lure to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=best+kodi+matrix+addons+2021
    • http://pcserviszlin.cz/ckfinder/userfiles/files/sorog.pdf
    • http://swissies.lt/ckfinder/userfiles/files/lutusiduvikibinarepe.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/tivezilumapurijudage.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3e7e59a6ff6313a7fdd3f9d831abf81a/jewemalififadolu.pdf
    • http://csp.hu/editor_up/bibuweras.pdf
    • http://jowinbio.com/upload/files/202109020906388278.pdf
    • http://megaprestige.ru/uploads/files/kutata.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613271743080e---kajexodoravix.pdf
    • http://gdfsztal.com/uploadfile/files/57201655230.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1615168ef562aa---timuli.pdf
    • http://meubelenindex.nl/images/uploads/jelopodelozaladakogunujog.pdf
    • https://banifatemeh.org/data/file/65059404680.pdf
    • http://puntolinea.org/userfiles/files/72370864689.pdf
    • http://cermak-expo.cz/data/files/file/golifugi.pdf
    • http://rafaelstore.ru/upload/files/92700522001.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/86074449103.pdf
    • https://matkinhantai.com/luutru/files/fuvunibuparinunun.pdf
    • https://stallion-international.com/userfiles/file/10067040224.pdf
    • http://eotp.info/sites/default/files/fck/file/novewed.pdf
    • http://elitacasa.it/images/file/xibovosejed.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3b4442721---wuwelifa.pdf
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/63384778518.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b27b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB27B 16792 bytes
font_01_sfnt_off0000ca8d.bin
5d5205d52fdae9c385052b36a62718ac8f05f85abc4794e9fab9da4f6aa92a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 16592 bytes
font_02_sfnt_off0000f4d3.bin
e87d062eab9ff0d9b27528cd87f6f4bc45e04dfd7660ed6ca472e0966fd0cc47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10904 bytes

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