Malicious PDF — malware analysis report

Static analysis result for SHA-256 135d1cac580f3510…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 09:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c2c124a44e8ccf7e3e2c13f0b143257 SHA-1: 6676cdf8f0022d2cc64c0e9b8ea840312d37f665 SHA-256: 135d1cac580f351058042b8e524667a0fdf9170fd870e903f7fe57a01bf41c85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting PDF vulnerabilities or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=swipe+up+navigation+bar+android PDF link annotation
    • http://saga.diamonds/uploads/ckfinder/files/muwirokowoditobu.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/64517046137.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7ef2caf4---suxexinupevedut.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/nikuvazojilasawojub.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/wajoxonomazaberiguni.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/lubadajoxopofeveb.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161369b6d83cb3---jinabadutuseb.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/paxitesamuwejitetovomar.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kawuzobagibenururesadima.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/17726428963.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/93672938375.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/sumusadalivegop.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210912141727.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/33295590212.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/tizogigevitexivawu.pdfIn PDF document text
    • http://haai.org/upload/file/40054813855.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac344f0931---82461589141.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/62ba26aa4f9356ea8799cb88ee83012b/wetefotavefim.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sazesuwuvowoturiri.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/13921461182.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30e4360e9---83206803091.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/dobuderinodetosudisawef.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/wizafowakegafuwoxabawufij.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/judafe.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_off0000d29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 19524 bytes
SHA-256: c42435d5f7963b7fc590cab291e93504e505a297fdac96058e444bb162a56339
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10820 bytes
SHA-256: dc22b99a88b52f5d6d60e5dc8f7da7c4bf4c4078407aab67b5288982f423eb4e
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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