Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5a7205bc752043…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 18:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e81dcb756f695ca6c819236604731200 SHA-1: 6a9f6b24dffe6d883b08f750b43357b0539f2f79 SHA-256: 8d5a7205bc752043d4f6e6c83adc5b21562419080662f9e1fd8d829f2ee9c5aa
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external links. The heuristics indicate a link farm pointing to compromised or disposable hosting, suggesting a phishing or redirection attempt. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=free+redeem+code+for+play+store+2021+today PDF link annotation
    • https://ataru.site/js/ckfinder/userfiles/files/77496382899.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/10159020302.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/34841813216.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/xufaw.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210902_A2D0C099B93E9BFD.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/fisarumilituloxoluwuvazin.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613657df542a0---8761350233.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/kopalivelobesadenos.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/dafese.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/99407642274.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/tezerawaz.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/95717829947.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/kijezomu.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/wufupujidosinoxelogideba.pdfIn PDF document text
    • http://capital96.com/userfiles/file/18580758036.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/61565054391.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/mibabemovanipapozisezuj.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161432b2b64085---guwesija.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbbcd503e---koxijukevexo.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/sukepadidikikedovodebin.pdfIn PDF document text
    • http://zamgph.com/uploads/file/020955486464.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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 18712 bytes
SHA-256: 8235e20558ed5f5ac4d50fefadfdc7129bd9197a1efab30154e0b39101a82399
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 10968 bytes
SHA-256: af7f9bfd8db68b254935ab90be3fc15dfe7d75b45c8dadc733e944056a235e4c