Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a621789384d004…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 20:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 665e2b92f16938f21e04e7a7a930fdc0 SHA-1: e3788923fb29e09d375800fc7d8abd7b151aad34 SHA-256: e1a621789384d0047764ee59437868bbb2803188cf0181dd59aa2bb068f1187a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to obscure malicious destinations. The presence of a 'Download Now' lure and a high ML score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to trick users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=delete+unwanted+pdf+pages+online PDF link annotation
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/tawenuvini.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/18912577765.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/sagararoputatisut.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/wuxarudenuzeruw.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/94085402887.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/94e9f327334f1476edc17716c7c4b711/basowotukokalab.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/jijelegemivivodop.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/wubitugokumaxirixovonetuw.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/feb1589e2b1643968543df8e15e0e8a3/rikududol.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0860c3a1ed---40134179907.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/25029804928.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/96800520074.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/kujagiwobobebijumepi.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/18108577727.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/11574018144.pdfIn PDF document text
    • https://ahha.az/userfiles/file/86577517963.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f418a4807---nisojupagetiruruxola.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/jumulawepekupavuna.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/19902435243.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/42257057909.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/talij.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/45811292240.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///guzonifonedalosu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ed3d2814d46dd9c76d7582a6eea69451/45565198602.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9frd8gpuckq3kn6g8sqqucukc7/sujav.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/mekibunipusuwan.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_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 10760 bytes
SHA-256: ac78bc579b0ba738e943533c29817444fd59b5ce1c7c541f9356503976ac28ad
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 19384 bytes
SHA-256: 25c4cdb5baf81f7c7a9307129b500d94449f6499b8902618c90f29673d292763
font_02_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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