Malicious PDF — malware analysis report

Static analysis result for SHA-256 282c6a3d59e2b9d9…

MALICIOUS

PDF

98.6 KB Created: 2021-10-07 20:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c475b2a4c82c34e1e9010c656200b37 SHA-1: 449ba71a14a95a6733571184f3f074de76c9b314 SHA-256: 282c6a3d59e2b9d936dc17e382c2052ffe66ac01beb00700e01a4bad7cc16ce5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The embedded JavaScript likely serves to redirect the user to these malicious sites, which are part of a link farm designed to phish or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://queure.ru/uplcv?utm_term=the+little+mermaid+story+book+free+download PDF link annotation
    • https://minervatech.work/js/ckfinder/userfiles/files/5837581760.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/xufirekuzuwavirevupuzono.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/40975a370e38c3efb471d726eaa6a488/wugululopadelirujipenaf.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/43426408787.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/neratefesemedep.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/70356035559.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/lusuvasoliwijividunug.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/vuwumitezo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a66588455---1353493925.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/22887160597.pdfIn PDF document text
    • https://obchodsezlatem.cz/upload/files/vesegolaso.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4d0b4e53e---geposaw.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161412d9ce092d---kuvoremej.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/82185276130.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202110010630082345.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/72339433618.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfd698286---46341380326.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/jamikumuduw.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/10791984717.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/jabekunosazadis.pdfIn PDF document text
    • https://architektor.ru/uploads/file/67903438146.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/wowojuradolaregone.pdfIn PDF document text
    • http://ebus.cn/up_file/file/13441879901.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_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 20636 bytes
SHA-256: 6f7c620a42c86df69c5cd7e863efd9af9373c9c75322ba6b2ffb242e2920bb29
font_02_sfnt_off000161a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A9 11016 bytes
SHA-256: 7f3ad3a60ca77b904122cd4a0695d8fabbd0316bbbc0a0ab23905dfdd253c22e

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