Malicious PDF — malware analysis report

Static analysis result for SHA-256 191df158b4a8dc74…

MALICIOUS

PDF

86.2 KB Created: 2021-08-10 12:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce9a6895f3fcba11411b66ed442db9a6 SHA-1: 90bfb46288e7435d2d787a65d0bc80f589114cdd SHA-256: 191df158b4a8dc746f77b579113c77f843223fea9edfea916138371e571f4072
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rt47n80it1sisr1nm2fr3uo9g0/73451271702.pdf In PDF document text
    • http://veronikavilla.hu/userfiles/file/jajoxiwulodiwamedugevawu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086eae31c0ba---tanetowufup.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/jidizatarafufigifegorome.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76ef5d9deb---28784722167.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pemilovufate.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/grhuj12dq51trdi1fp94voq1nf/liteguxeruwuwiv.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/vajapaxu.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/zeketetuladavufekesewa.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/35034239557.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eb56d0b524e1fe108eaa8ee82bc9892b/fevimijagulazija.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/bidamevi.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/21225286341.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/97226744390.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/91914802163ea020b177e63f9c420c9a/fidipo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qug11utqjejig2ope97q7avfup/43274905125.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160758c9e7f836---93961348896.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092cd3634d1f---37524527689.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aa907ae9383fba2b74a37836b1843053/dedeneli.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teganolinomovaliwaguvo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cbd23c90fbefbef373ade4b6eee3681f/femizelofi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7d1581ce4---43420211047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+inform+death+in+officePDF 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_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 17096 bytes
SHA-256: 0339194d31deffd9e9a8e226fefb04f69079f462caee12d8c4c3074649e55ff8
font_02_sfnt_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 10820 bytes
SHA-256: ef985927cefd2691755fb27f498ece3f0f655dd2b0718e422189dc8b04c20284

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