Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b158e685033553a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 17:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 59fc57e9b180036d75fe849ca42b1891 SHA-1: b15c665e9bb14e5189388f36202795d5ecb9aa4b SHA-256: 8b158e685033553af40c8ad39aefe4446b40157912d48ed6bc089cfda8576161
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further payloads. The numerous external links, many hosted on potentially compromised or disposable domains, reinforce the phishing and distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.vandiestbrandstoffen.be/uploads/files/24098282159.pdf In PDF document text
    • http://ecohort.com/userfiles/files/49598439109.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/30865126358.pdfIn PDF document text
    • https://codecs.ro/images/file/46625659269.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161381a332e393---20611690503.pdfIn PDF document text
    • http://vce34.ru/attachments/file/parobamixufu.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/31584178888.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614da99d4d374---6308170024.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/diliwenodatunugi.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/18177216927.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vuvafuwimute.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/pogemoverunexapekojosodi.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/guxirokuder.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/69220187419.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/zedapeseweraxe.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/26993410348.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/61897899522.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/vobeluligibaf.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8b2649b5f---81744321074.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142f9ac2fdcd---52814459140.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/senojoboxuxinapurogoxu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/dudupuvixow.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/14605778569.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/wesomerogugadizebome.pdfIn PDF document text
    • http://wohingltd.com/userfiles/fabejapazebufob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=state+the+relationship+between+the+energy+and+the+frequency+of+electromagnetic+radiationPDF link annotation
    • 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_off0000b509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB509 11728 bytes
SHA-256: 2b7564f7cab50972b97f8acd2f5e843c4954bb89e9ec084a6004cab4c5307463
font_01_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16116 bytes
SHA-256: 8839b1aa32b7ac5ad16ae18a4a955a34c720df21973f390d242066ba5b401a49

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