Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d37c62e34e7c221…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 02:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36f767121123e128a4e6ec2210889361 SHA-1: ef33ee177d9b024abb4860dc09c21160c8eb9b0c SHA-256: 5d37c62e34e7c2217342bec3a2bcc2f2f86e783bf84c338ace4cd2b420572a31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, likely involving the embedded JavaScript to download and execute a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=addition+and+subtraction+word+problems+with+decimals+worksheets PDF link annotation
    • http://marinapogon.pl/upload/file/pozisizidijovitu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1098114f9---14428660234.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ce254a1bf88353b7962bb205f432acd8/55570718768.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d77ef9619680acf188381de54722ee1c/sepawu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54101079951.pdfIn PDF document text
    • http://thaide.org/userfiles/file/lusomegakulizibad.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jexuguvumitusara.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/82510719366.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nnr6d6054i633hisru37ts3gb4/jusemoniwuwerub.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/47954886892.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/gonakusuxu.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21346418048.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/juwidelikufusa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e9f0952c---33833297917.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/pozokabenolekagasale.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/devuduwetijidozuzo.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/80614194942.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/43269304802.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/davezegotamobitid.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/rolanixofif.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/gitopapofifasuxotaro.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/jajozisolimazuvononid.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/de2536fd5ff3a01a61530fd1f62bbccb/rogopoj.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jixumemowun.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_off0000c164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC164 16268 bytes
SHA-256: f5c64a4284fca3055b64a062ba4daa5d086162a4ff315d76838576b9747f1792
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 11176 bytes
SHA-256: 412486cce9f900c0f25971d4e708c05cb7107203d8dbe8b38bff9a1aea68c372
font_02_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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