Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ea624ff93678a6…

MALICIOUS

PDF

75.9 KB Created: 2021-07-17 21:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e981ea9ec9cfd2c4f9d756b8feedc250 SHA-1: 961d4017d984ef6c8ffe0b2334f7eacc281fcc59 SHA-256: c8ea624ff93678a6751b09cfb156e10a8bc9f17af649230cb352fdf03d42bc95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a chain of malicious redirection likely intended to deliver phishing content or further malware. The document body is unreadable, but the heuristic findings strongly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6ac559d4---toxakizim.pdf
    • https://playerpress.com/ckfinder/userfiles/files/lomefawa.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01ba6176b---81200063641.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/30f041ea6971a57ff2ec508f665aea61/32466542979.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/1jjc25ovqu005sved5i3uftisj/babolufelezuladiwideneb.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a068a1776ecf3fe6b2acace085c23ea/61776841539.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40114e340c---xagur.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1f213aa5---kiribat.pdf
    • http://zgkimsteszew.pl/img/upload/files/mozusadenigegoxok.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/22141063582.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/figuguvafafuxot.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d1f20e74---27935140246.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5d574838---webejatonimixowuzogur.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4t7sjivd6bnt6q7jaa1c252q12/95644290358.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df34f383ea0---jebexumulile.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8b65adc11eb34ba1a44e3b94b5892c08/xunadoru.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160deaeb935031---zerasika.pdf
    • http://accu-chek-event.com/ckupload/files/45298755352.pdf
    • https://perfecthospitals.org/FCKeditor/file/gefisudekalugotixe.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160be687c3e97c---dibiparigixifomijez.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2151966bc---68527821031.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b17adb551d6f54f083efb40d667d4384/65910160211.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xisefifoda.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aae70ba791c---73678801538.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=busting+a+move
    • 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_off0000c858.bin
d949681139434ab9c956518d25151120a1a89026b6bbc0a6bd2c34c65143d7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 16248 bytes
font_01_sfnt_off0000f257.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16792 bytes
font_02_sfnt_off00010a6e.bin
fcafd1d084158e553f587f11e85e92a17fc63cd34f1b3da37e36e727fe5664f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 10524 bytes

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