Malicious PDF — malware analysis report

Static analysis result for SHA-256 6145c0620f2f2bc4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 06:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ac01c10b3de5ffca21f7f375ff01e83 SHA-1: f125bc8630b8885674806bf983eef938f1d41d81 SHA-256: 6145c0620f2f2bc407c05b70337c81fed74deacbcfb43c74df4a227d90bd8d37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to various domains, many of which are associated with link farms on compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=raja+hindustani+mp3 PDF link annotation
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xolifuxavigapipajanebofa.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/muvewedurepepusogesej.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/34474089180.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/72168966659.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/xetugitekagudoxurito.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/sevalonesosofapamiled.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/lurodufivadojuvevonu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/xadebizunezogasup.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/11415291667.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/92493657785.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64465520689.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/42778571675.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2c4e8a62663e3785ddd6966482b79b60/vipekimafina.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/20658272279.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/50600596664.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138427d95bb3---14947646151.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/35077032617.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/489c7fe2da4b9914a4f4360dee220e73/239852505.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/rigobeniposatedakuz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562cc5a7fe---fidasagoxafobexotone.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210919_8FE3A5B9E007E439.pdfIn PDF document text
    • http://clingac.es/d/files/38770009939.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/volarebawifedez.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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 10704 bytes
SHA-256: 87d5328475c889930e5721d7142773b96c5e493327f038ae7fad1b5398a1409e
font_01_sfnt_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 19040 bytes
SHA-256: f90def2c7d680975e7532a8dec341fc4092177d4cd368a90d71111c3f0255df9
font_02_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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