Malicious PDF — malware analysis report

Static analysis result for SHA-256 0576912b0636fdd9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 10:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aacb1796a23210a8366453d8e4f96cc1 SHA-1: 084c822ca91ed52cb8a8ed12001d5943b0e6e18d SHA-256: 0576912b0636fdd9237132c4e93747a617ef168b8ae02c840d5f9b0e4f6b5dcd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised WordPress sites or disposable hosting. One URI specifically points to a raw IP address, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://urbanlivin.lu/userfiles/files/rexexibivetusabifitevibiv.pdf In PDF document text
    • http://grupophi.es/uploads/files/5804836502.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/pizogerizerixikenojixov.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/wadumilawegujona.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5b7e6fb4---kobopexupamuwitema.pdfPDF link annotation
    • http://scsytech.com/upload/files/kadatiposovebuvefo.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/32511057957.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/96089476487.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/39199953419.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6ed19edf8285bc633335252ce23bc67b/kituvojefilizulinem.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/vorulagolobunota.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/58373716627.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/9478631031.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90831048681.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630944540.pdfIn PDF document text
    • http://ducnhua.com/upload/files/5967061635.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/17087903222.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/wivusesokinudoja.pdfIn PDF document text
    • http://clingac.com/d/files/7234392746.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a555c3bf3---goxofota.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/mesukifatanazikupifagezit.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/29066570683.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/lapafofivobefarerotum.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08eec07ba---puwivopujesopatinowewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=i+am+not+able+to+update+my+apps+from+play+storePDF 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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10872 bytes
SHA-256: 171de9d5d55f6114f4fbeabeb842ed322ffb472a436e6d224e900921620f36fe
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 18036 bytes
SHA-256: 662f3174bfbf532f326b0e09bc274e60b5f74ddcda3e494512fd353566404e6e

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