Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b226d55dd92ce9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 19:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4b9cc3f6a8625784998115d6cf34fed SHA-1: f5138f015e3955b7aed7f8b518bcf6cde13bd811 SHA-256: b8b226d55dd92ce99849ec421460a0c79501f1262910b7ca8d195d999576fcc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, 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 link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://slbreakingnews.com/ckfinder/userfiles/files/66474297413.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27c0339c5---zubezinavuxopo.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/61047794399.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/81120405970.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdcd11d4---94970102872.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/takifapotuzimusiwowapeva.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/gigized.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/lirebisatumovadafag.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613662817b745---timakesujazerozuladuwemu.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/55184938639.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8d1e4dee---pokir.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hg419jc817gvfscnndgdfpeks/xinozemibavamiwofemodof.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/tusexalurasudipaf.pdfIn PDF document text
    • http://saydersan.com/firma/files/74678659802.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/61437896637.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/37865221704.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6446c8d7a69a1694d21b410c3e836945/31604120253.pdfIn PDF document text
    • http://showpelec.com/data/file/20210907_230447_326.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/28328535784.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tusexabijadilufol.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322ee9a60b2---kujezoluwurimex.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/taxeba.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/85sio8io3hchofc322t3ueckmu/melunu.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/94915994847.pdfIn PDF document text
    • http://slovoveri.org/userfiles/novegojeniwerexox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+change+folder+permissionsPDF 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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 10952 bytes
SHA-256: 87d6c189e45607c198e9f53f8ff249049f6e9dc919c9dec121e2974607cb2028
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 17560 bytes
SHA-256: cbfff234c44ceca32389c60f7798474fc440a3648e514573c2bd72e4d365f1a1
font_02_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1