Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d332eed862809ee…

MALICIOUS

PDF

96.6 KB Created: 2021-08-04 13:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3d9b1aee4c72ce504e71838b912e56b SHA-1: d2171c57c9096c97323d34f140a0e58f8e41dad6 SHA-256: 5d332eed862809ee9f4801e03d02c32248c083bb96d2f73fa35e03360a32c9f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tuktioct7otr0d2jqqr7rctkun/zemonibupogiluv.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://cdmsig.com/ckfinder/userfiles/files/23995839152.pdf In PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wejefotekarorewamuxa.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0679639001627778934.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/29364450341.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/kewigaziriwujogitisubiva.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/difadogotixuvujosezajuz.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sinolibela.pdfIn PDF document text
    • http://kunbot.com/upload/files/gudutojamuboruxemi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160781f3adc5a3---70846771961.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/46211370930.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2850ca6aff---fatidobexavuboba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c4ff295b---88336472109.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608446e59c725---61454593832.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/68387294973.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/29916925716.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4db5cccde447f49fc543db3f1e753b63/24432615580.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae33e4b98---jaluduvasijewubulixojar.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4d91f668---98123652309.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tuktioct7otr0d2jqqr7rctkun/zemonibupogiluv.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160729e2fd61c0---4950274398.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/96627836966.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc2f114070---zekujigu.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/304474300.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vkt1bk3ttnmsvmo7qldgjb3v02/nuvitinedolabofumezuzirek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+write+a+loan+agreement+between+friendsPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 16088 bytes
SHA-256: 21ff46de98f0902b53a5c0c946916a1dd4551bbaa4204463728281c4bc54dda8
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 10916 bytes
SHA-256: a0a4e8553bd30a619e2a2019bb7e7a7ab559cb6e445ae2632b86dc380b4486b7
font_03_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 17420 bytes
SHA-256: ba214146c3c5a8dba48900bc574af5da6b9197dd2d97a507415638fb224dfb38

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