Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebaf4112b4b1ee63…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 07:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69eea40dd42b103eb4d4ff1b96329be7 SHA-1: cd676a953290f25a7000aa9c970b1fb68b7c5a7d SHA-256: ebaf4112b4b1ee6305fd64e728f545260be63a5e701bb230cadb67078fbf96c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these compromised or disposable hosting links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://grupopiscis.com/upload/files/mobifepaxemibizit.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4c7vcg61cq7fg9sb9j85tgg9v2/94526593587.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003caf8dd---82530350678.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/61022823504.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/dalelapesuwij.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/muzaromoruk.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/fonuwuxaxonopugu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dfc9c2ce5---zomeba.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/03938672203be251c96c07d30e9a8763/lulatirotumuputat.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2182ada67c56046c1074dcd7eeb6f8b4/jenuropoditokazonelimuno.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/88eae16d2dc93779a7aad485b19f0e83/wogisebifipamanow.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/nadikuk.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/64b7d2d340d0becbffdb4623c11b7c29/17363578537.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/dajolunuzopezivaxufumubu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/ximogabixageromirejaki.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/39168920404.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/zunebexezexemagavewifi.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/7602610358.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/82990412207.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094ccbbd9387---mirewawunatabotexozarataf.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075f63582cab---belujegaka.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/99118148732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=green+valley+lombokPDF 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_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 17240 bytes
SHA-256: faf970fa03775ec1d25cf4c040734423c670f8553b02d087f9c5604efbff7ff9
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 10364 bytes
SHA-256: 37cb8165ca08a1943b8e46b0c5331b3779ba050dfec30a94ae60cedea12059ca
font_02_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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