Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c17c1050de1f08…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 12:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6e12f886f48e2ff10f73229840e0d9c SHA-1: 9536933ec5cd3dc15eb4dabc5d7dd8bd26bfd73d SHA-256: 09c17c1050de1f08ae3484baafd195ce8bd8c2da2eb3e03d31183c98049c4101
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, several of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://mbjarrahi.com/UploadedFiles/New/file/xitodusewuliluzozumuru.pdf In PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210912_999EF937FFA8B006.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/lidifiviwelisivozedijo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161327ddde586a---vidoxozibiwe.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lufisutenuwawizosefevema.pdfIn PDF document text
    • http://bwc.lt/i/57925796439.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rigefiropoduvuzafa.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/mokup.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/bebiwu.pdfIn PDF document text
    • https://cooperspick.com/files/nexopevoloxofaxoj.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/50850624079.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fekulu.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/83430573434.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/8677608572.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/12955633698.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/dirulufis.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/45646499455.pdfIn PDF document text
    • http://electric-kernbichler.at/fulepojaxi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613edeb2c80d5---21617958712.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161316a117b43a---wuwit.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/xagevawitowimun.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210905/files/20210905092014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=battle+cats+mod+menu+apkPDF 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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 10728 bytes
SHA-256: cbbe2968fba12321abaec518b1e73be50da89a4cc11ec0599cba7c47064b5152
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 17556 bytes
SHA-256: 923bd6a7cd6954ef3a6aac5f23ca2513759d64feb286d42fefad28ffbd9c17e9
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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