Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ce89f281c633c7…

MALICIOUS

PDF

119.4 KB Created: 2021-09-01 12:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eba62201d6a18040b063f067da76eabd SHA-1: af1fac7c00059d6a281d96523159af4416706a01 SHA-256: c5ce89f281c633c77cf5a1c495c0c711ee44e2a5f9a4ebb5d2428ca85bfc9f55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caca6040a0---18757221300.pdf In PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9274499b3f13b4d7439e92188a9f2b24/gesuxonuxugo.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/56891182962.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c3e86776---bamulobesipekenuli.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zutemevox.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/42626409669.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/18123037544.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nogakipubomadip.pdfIn PDF document text
    • http://toonesk.com/upload/52051586915.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/67274554965.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/28315883879.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/itssocbufhohdafqpbaangsl26/jisirix.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/203c98e5990a9f0feb33a22c20000aea/masobuxagu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5acc77e086---zopijuvaritoriwu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bc5ebaf06c7551b8dea3c524d7f34355/13705134570.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/81171683691.pdfIn PDF document text
    • http://esteel.my/userfiles/file/nokepilefabepavisaj.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/52014909585.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/75175622539.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fa52fe0ad03748b19d96159e2de5a8cf/29171478092.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/venexijanosilif.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/19283025660.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074094b67bb9---najutagojegeveles.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/kekabevotazevenazaxi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/84965742628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=postulates+of+bohr%27s+atomic+theoryPDF 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_off00016741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16741 20936 bytes
SHA-256: 565d6fa8162f51c8d306b8d4985de020134bb18dc41b3d1f68d06c5c3352f7b0
font_01_sfnt_off00019e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6A9 10884 bytes
SHA-256: a1570eee80044f4a56098ddaacc9c154517b713b54822cfd0d9870140deace78