Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6560c127ee3281a…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 00:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89f7dec49e2c036a019570e0eb831133 SHA-1: 6e468c91fbd41c66085cdf0086c6966ef5347c76 SHA-256: e6560c127ee3281a922a33a92f70b31002c10d15eb60f5cba70e1ee465a157ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the execution of malicious actions or the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a6195424e4957e6b7c7b73a924c8fc28/69506748779.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc36a2967---naberita.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef51cff05---robekuwemikosiwekip.pdf
    • https://ms01bet.net/contents//files/dugodokabazivop.pdf
    • https://juegosinflablesarizona.com/files/58577922626.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/teniwulumixu.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/pizonujifavukapibikak.pdf
    • http://haozuowenwang.com/imagefiles/file/90717323642.pdf
    • http://www.pzkexie.com/up_files/file/43415412599.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc46f84ce7---60338280745.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a4a0f890eb65ef388e973d2c91744c48/zuwemakejebiketixe.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/refuludotitelazikuz.pdf
    • http://to-kajihan.net/js/upload/files/37716729292.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/notibodusesuzugonabale.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3ab36cff2---zojaloda.pdf
    • http://hnkingdee.cn/Files/file/2021529161040.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/9938sb65127u0i0qpfarb6mpet/81887867129.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb626b520---gelade.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b385a258b947557d46caa97e62a75c49/8667481135.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/rldogirt18b6ak8p1n4f1fe3dt/14630895956.pdf
    • http://thesetnews.com/images/fckeditor/file/fijoguwixabizi.pdf
    • http://firewheels.pe/userfiles/file/sezep.pdf
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/wodisexuromi.pdf
    • http://paillasse.hu/userfiles/file/54529940954.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+turn+pdf+into+doc+on+mac
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b9.bin
35fe4eaac2f3ece87a06ff4b803994b7e1d976d57519c5505d8ae66bb7fa7465
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 10612 bytes
font_01_sfnt_off00010bf3.bin
7c61a99fdad14a4efd951f6b84906d10b613a864709bc8a4c568e72e932970ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 17116 bytes
font_02_sfnt_off00013862.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 16792 bytes