Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c55c4840616be3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 19:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20fc9ce5facea2dbb58b3e96413a1775 SHA-1: 5122cd0aa896e43a101ad1ddb98cc0a0353a5531 SHA-256: 63c55c4840616be320293692e2c2d4b544d2694345e64cc4df6b750aef4645f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. This pattern is commonly used for phishing or to redirect users to sites that host malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=sequal+eclipse+portable+oxygen+concentrator+manual PDF link annotation
    • http://kubak-ubezpieczenia.pl/userfiles/file/wujupizigimebilon.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/88833198067.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbef178d6d---99637945280.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/waxet.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fa71bc63c883c4b99f213ebcab6af759/zelukidop.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/69080157204.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/sadidena.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fizuwigiwazedesaribezupat.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16122b8ada53e6---2951417525.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4dc277beb01dd83493bb430a7f4ac89e/zalapijisigalebulit.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210730_001346.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/lasuxakaxepefeberu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/126rhcduevpm1fts12bgu2vcav/66354668057.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/98616459558.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ef16f1eb---nokisexiripekumemexikikip.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610904bc5b78a---71436877724.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/vuzafib.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/9225195548.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/49497286522.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07b2b2e5b---dotogitomuzok.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161146ba43a2ef---79016991989.pdfIn PDF document text
    • http://lidata.eu/files/zogegimodokam.pdfIn PDF document text
    • https://stopserv.ru/files/file/levifebeli.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/jolixo.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/bujidirimiwuxoteko.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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 11392 bytes
SHA-256: 896babfd0663b0cee64b6d020e957a612612bd4d2c79d71a4b5d4ccac1f0ac68
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17712 bytes
SHA-256: 21669fe386825b6843e949a64a8b68f6c4d4c2310c8957ee6d0d966edf0c1ab0
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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