Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3a588f261bdc44…

MALICIOUS

PDF

74.1 KB Created: 2021-07-31 03:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 15f11a2e80690245f627d67425a9eb55 SHA-1: 09ba71d8734cc22592e5d98dd95b9a054e0b3b6e SHA-256: 8c3a588f261bdc440ae30dbe00b67b5a0a7bace972f7af068e9f333b3449082f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. Embedded JavaScript streams are also present, suggesting potential for further malicious activity. The presence of these elements indicates a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1sue3m5lfv7pnagpe70nie0ve2/nikosilileruv.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gvom8eqir8t9ifiq59g29rlfl2/88908496715.pdfIn PDF document text
    • http://sakem.org/userfiles/files/wamafenen.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acce47bea0---dalugozi.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/6966790214.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb0743e1d---benuludu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63f1cad71c---62956311209.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9f4d224e---ruzinegavalokeju.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/77112687917.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/j7ai2d5ur47tjtuv7gtekv7vd9/34818242109.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210630031509344750mgggch.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/sefefaz.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/lenifozetav.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/latukexexile.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/2t1rrhk2gdothgl69fq3m3d3k7/pakurubo.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/sixubibononud.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/jogafererupuf.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/puxobafesusuzupugiwegipa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160700a910f2e4---rimude.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/viwowetejekapojovu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/11a5f05641847073788e195d03fbcfdf/bobelufegelavuvuvupudi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/652614bf55eb0661445be27628e9a046/jaloramegodubeguroxex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mera+bhola+hai+bhandari+dj+mix+song+download+mp4PDF 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_off0000c078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 15432 bytes
SHA-256: f97281e82e403f857933c94da3f3c16121b50a98196461b096cb18cfbfdb7345
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 11268 bytes
SHA-256: 916f44fee2e12d1b72c8471896fc2b187829d9c512b7cfeb365c501ddc3fc2a1
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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