Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f9d9d975d310e3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 07:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44e60551227a95afc5380c0f26507631 SHA-1: aee52e160f7068ba5ad5808512dbf6ef6c17572e SHA-256: 03f9d9d975d310e3036a8f68e1edd14b63ec55fb3503ad53392a1e044a5d98d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=android+as+proxy+server PDF link annotation
    • https://adikkeempat.com/contents/files/10279644780.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/gewevupopugojekevadofi.pdfIn PDF document text
    • https://ptogel1.com/contents/files/48355387538.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/poroki.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/36025703739.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/zudavixarudetodukamu.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/kusoluvenife.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vuxifuvumakok.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/4887789856.pdfIn PDF document text
    • http://tulga.ru/editor/files/jaroromi.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/wozepab.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372568474---bajurupupuwameliwiparaz.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/tudaxazaripomopozixak.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f8932a62---tulurije.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/31907421723.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/95432889571.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/2521324461.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/36674845041.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/rafurekexisumedu.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/49980367662.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c87b1c3ae37d7b99defeb7b1426b4c3b/21211978062.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/laxuxefinuzamonivejivi.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wutolekelomuguviwiveso.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/67928744071.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/kipibarar.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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 18596 bytes
SHA-256: d28a06ba58a5dc95ccdf619e3a773520e403911f77a8411a3d2c80deee23836c
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 10504 bytes
SHA-256: b00e2d40ce06b7415a92569d8ce0e3d530e35120f7cdd031a931018603fa1cbf

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