Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8819800cad9225…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 03:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41fe4e84da8d64d63555d01f4a1ee5d3 SHA-1: d493bdfefc7167c6a721edec093954493b18987e SHA-256: 1e8819800cad9225966bcca3d964da937e4f837fb07f0c45b7823bdc749d8519
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JS suggests potential for further exploitation beyond simple redirection.

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 https://wastran.ru/uplcv?utm_term=themes+for+minecraft+houses PDF link annotation
    • https://sklepbonus.pl/userfiles/file/gapas.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/mimebuwojitigoberezego.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e2jau1sksjj8bnlrl6qes1s92u/ziwir.pdfIn PDF document text
    • https://avela.md/userfiles/file/30437980654.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/43159324760.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/kanaparoxima.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ieu7bu898d1r6sl6jtngltuaj1/verivexap.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/59029378862.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/77322829260.pdfIn PDF document text
    • http://sayarbobinaj.com/file/27787444844.pdfIn PDF document text
    • http://teraval.cz/res/file/56527338068.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/xukavobasesiziliniva.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210910_195152.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xadog.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/zimikexeweje.pdfIn PDF document text
    • https://sharenkon.com/files/joluzubesimuneboxomive.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a13ce63fd---dipixaterurufawak.pdfIn PDF document text
    • http://japhina.com/upload/file/87177300284.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/77652321164.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/55373384914.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/55745685792.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/likafamitobuzi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c721012d6---nimumemijujupimeb.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/29563898018.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/fanakaxubimabedul.pdfIn PDF document text
    • 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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10620 bytes
SHA-256: 3ac49564560222dd8a522894376fd478e05869fccc57dba93a0c2c313b6f8473
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 17264 bytes
SHA-256: 7da0419a9737362ec5fda8ff6526cd1c32b619bc47a8948fbd6a60862151274a
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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