Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ac5cfa96cff3d7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 07:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e54f916f80fffdb358516bd3b968369b SHA-1: 724145da44bee780da3457ac802a6bd572952d99 SHA-256: a3ac5cfa96cff3d78cf2c0b5780cfc1bac406a25fb6118e5de758b557c641500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://badischer-kunstverein.de/ckfinder/userfiles/files/dabujatumuxujemir.pdf In PDF document text
    • http://vantaidongsaigon.com/uploads/files/87113138172.pdfIn PDF document text
    • https://onlinendttraining.com/files/viledafogek.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c6e9c39cc2370a4f5836a3c50f16324b/15498533928.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbfc8bc22---mukije.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nepedikipifesefuniboriwak.pdfIn PDF document text
    • http://goldmustang.com/files/files/javarejedubuxivewun.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/bunuwimatileli.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xigugamizapir.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/mezomus.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/4679176068.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/dajebezupunasexopiri.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fiderakafenigakekar.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/81280321641.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/79355002783.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/75305414026.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342563ea8a6---29997469732.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fopozigonatodupusobos.pdfIn PDF document text
    • http://puisan.ru/uploads/file/93224688639.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/83121152184.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/70211604412.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/zepulud.pdfIn PDF document text
    • https://servauto.fr/img/user/file/narunabofubuwedawif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=play+store+download+free+games+install+pcPDF 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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 11164 bytes
SHA-256: f84a8213c84f59abe2c502e9a437d70f2cd933fd988a2ddb97e4267c5383ac18
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 17164 bytes
SHA-256: 96bc5fe16d5d4d87d86ec940340e421a8c57f47091fcd68f54d41dc32c5de1bc
font_02_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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