Malicious PDF — malware analysis report

Static analysis result for SHA-256 a423290214e44434…

MALICIOUS

PDF

86.1 KB Created: 2021-10-07 21:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3ec8938b14039095a7d15330ca2ad5a SHA-1: df93f401d5a3d92f9b857d61ffb913fd686fd815 SHA-256: a423290214e444347e97acc9628c123730821f5c6282153975a517a853f6bdf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=wolfe+tone+square+bantry PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b5b92380---59763317803.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/dojoloserozifad.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161458f860addd---19042312306.pdfIn PDF document text
    • http://bushurov.ru/images/files/lubosobafokarafibo.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/84823891961.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/utrd0ent878tspgccshegpne03/15610854870.pdfIn PDF document text
    • http://telecycling.info/files/file/tebonurebozixaseviwurijam.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/sikolewezawafuwuzajoteba.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kodotiseremurenobaku.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/nojukozuximasono.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/22943324102.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/45690587782.pdfIn PDF document text
    • https://jurad.eu/files/file/kukalabisaxezipixofewefe.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/56692968258.pdfIn PDF document text
    • https://mindtrainingsystems.com/userfiles/file/kadelinifugalidos.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/jiwubonosigakatagin.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb41e32fbb---2981425088.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/79723351646.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156dbf80f3af---41873005353.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/5610878754.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/765f52d82a78096cded80bf1108ff52d/wadexemuvutepebe.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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 20148 bytes
SHA-256: c9327affe4c0004106b03b75774ab76ffc3916758174720371732c41fb91f653
font_01_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 10608 bytes
SHA-256: 8c50ad701298767f051b86783bc70553804bbfbfaa215d4e21cb7156a4a0608c
font_02_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1