Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb96937d70a4adc3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 17:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb7bfda342b1cff59808d0cce9f45e93 SHA-1: 8977cd20ec7ed03b7e92d249da155224ecb9f9b8 SHA-256: bb96937d70a4adc3b85c0ddbc985268dc92c35112679df8e3e5aacfc475173ba
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external URIs, many hosted on disposable domains or compromised CMS uploads, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://oniceh.ru/uplcv?utm_term=poetic+devices+definitions+worksheet PDF link annotation
    • http://wabasnb.com/files/fckeditor/file/41892113061315d832c9ab.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/videsozoju.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///savuxazukivetigeruzosebe.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/85387220462.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/muwijol.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/mofofezosufo.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/93279626297.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/53275665538.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137317431ee3---muvaxisaxexoxezigidovo.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/kuponoxunejorusubo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161380ef4633d7---33559049279.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/fogunemokak.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387b470d36e---17287631439.pdfIn PDF document text
    • http://gotween.com/userfiles/file///38595756919.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/jatobebagibut.pdfIn PDF document text
    • http://markone-tools.com/upload/files/tixevi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/99782fb5b48ee6d852d6cd237eb52eea/53163992099.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109051814155367.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/bedojesexiv.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/5209293103.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/69466682903.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_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 17228 bytes
SHA-256: cc14a6730e268224ffa67e6c5c5b98841f4cd2abffe19badd7431a0d690fc81c
font_02_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 10608 bytes
SHA-256: dfbdebf2f5ee0db18b8c18950dd001564eff95272320fbc0e256deea57833fd6
font_03_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 3924 bytes
SHA-256: f63539d781088cd2b3ea75a846813596615b415745e76955f37531d8539c57fe

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