Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ad6eeb741df20f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 02:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c21399cbf9ea5b1f20e60d6d6e49ef80 SHA-1: dc5a734171d3d1f846c7654de06422fc1b749bff SHA-256: d2ad6eeb741df20f447a56014fd222115fd67682d6f21065981fc1c27a3968f2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, further supports a phishing or malware distribution attack pattern. The embedded JavaScript likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hongming-eco.com/userfiles/file/1469864994.pdf In PDF document text
    • http://sushibelovo.ru/files/tisidun.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/desuzumarimalobuka.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613040eb835ac---rilemajomegogefi.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/92590504043.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/moruwusisujoxamekodu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442b9dc361b---janedof.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/76605858736.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/8506909579.pdfIn PDF document text
    • http://partnercable.hu/files/951519226.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/nojuromowivowobaporevebul.pdfIn PDF document text
    • https://2acontractor.it/images/file/limilekipenigijopirakowog.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce291e0710---xegetenugukafaduri.pdfIn PDF document text
    • https://lesura.net/userfiles/file/53861917951.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149dc96f4e---55956120131.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/mijokakiv.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/49801307077.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/munot.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/92940694666.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140cad3815b5---nakowagopoporiw.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/zekonivofepurulagun.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xeboxux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=google+play+music+upload+qualityPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 11052 bytes
SHA-256: 19ae85c6bcd0d9fd11a0c1ca26c9cdcd161613903c0f2c9bf90f356df4463230
font_01_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16236 bytes
SHA-256: f9e253f9e3fbe820eeada00cf67b3bdc0ed8c5865f339adb390aeb470e3cdd72

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