Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a442e3869b58a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 19:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81712f5ecb19d5763ebeeafd0c37e29f SHA-1: 7b62cfb404882adf5a5f29598f39a38191b6a467 SHA-256: 424a442e3869b58a150cd8ce5ea9a59f37f8891e084dd0b88181eac13b050ce4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be disposable or compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://hockeydh.com/files/ups/files/49545219514.pdf In PDF document text
    • http://nonstopsushi.com/uploads/files/79474068494.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/36294917037.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0738680001620122649.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16080818299697---21832586218.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/20208690105.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/zovuzolut.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/et0ap5h3bmusnqjrmfb16vl9rc/galalavururapepi.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/xajuwiwimonewegax.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1c518552058370fbf18e7ff5ff2afba7/18608729297.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab207d7fef7---gurexozuxawasef.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/77315074470.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839a738b95c---64972463165.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892c5c062ae---36369571852.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/75489564125.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kh7cqr98oo2cnuc3l7bi2buo05/84282519880.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/68107587531.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/pimojozazefotomi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/42113063609.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/18021380405.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/82498702608.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bcc9be99439b72702c674beb6c83ac8b/47378959863.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/wabepozesigepo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/47092471428.pdfIn PDF document text
    • http://bjjiffy.com/upload/kidejufiduzukojasixele.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xinipixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lmsw+101+manualPDF 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_off0000c444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC444 18064 bytes
SHA-256: b83197d464fb6c0a69fe1f569d835d18da37e53eaf954f42611a7d8e91cd2dc6
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 10044 bytes
SHA-256: 9fb7bf694e6bb05b0ca8888ba18b4c2e0bf408e40211091797acf05cc1f76f81
font_02_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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