Malicious PDF — malware analysis report

Static analysis result for SHA-256 181350a5b36b72f9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 00:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6328cf91a7cc810f4b915915c1c84ade SHA-1: 5512c3745fd47a06f047afdd7c3ae238945c4dff SHA-256: 181350a5b36b72f9b506fa431f652c3b0a8bbc3f60d32c464cbeab28c6ce4008
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=is+kmno4+ionic+or+covalent PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/rut340g08rqsltmaeesb7gu8ie/tekejubabadazadivagolevu.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/2175443434.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/sekafetaxujekeki.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079a556494ab---72984920078.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/44163563715.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/n1jpcq0mldlnbgm3lcdfeq8fg7/4471369190.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb016b9b2a81be1385f8a37f3d887fc3/89526022585.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/lizetemiwa.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/55074805594.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/602629102.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3978ca58cfa7f1fd71f8ea3141cf4587/67018226869.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0p66hvcjtvilm2rji1li33sdaj/visiwufit.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nuwigapuxe.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160775c6c79569---91994764184.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/ledoxe.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/gilozunoforovupa.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/duwafozawuwuk.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jcis241mv8kouj27e7ut39pevm/57610010579.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/de8300eb1eb0c0830a621aee27c2f60a/wubupawunaduxipujemu.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/pofijiwokamopugalidus.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/83404282890.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/99062492971.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a198866558a---59745070506.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d604271f3f7---33302686181.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_off0000bc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 17116 bytes
SHA-256: aa4f094f375ea8a79abf84dedeca1b56acd8d9cf377ae6bf55eb286a7e3f4107
font_02_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 10576 bytes
SHA-256: 70bb3986acd1e31b4b0266b4068811fba3eac54fa7535ca0b7cd1c8167cd9f87

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