Malicious PDF — malware analysis report

Static analysis result for SHA-256 142de8e3f64659a9…

MALICIOUS

PDF

142.7 KB Created: 2021-08-15 06:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1fe023b48fc4fff752b970254492fe8 SHA-1: eb231cee0d247e0def919b974ee677df3b8946eb SHA-256: 142de8e3f64659a90b858e60b8608ba7a9bced07bf00731f991d319838110c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9467

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://irlanc.ru/uplcv?utm_term=cambridge+empower+placement+test+pdf PDF link annotation
    • http://veszpremlizards.hu/_user/file/56506340231.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/xulegonuzonidixusaduw.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/wugugelazupemupubi.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/perokab.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b08bf2194---71658779240.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/96325241869.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/gifub.pdfIn PDF document text
    • http://jkohut.pl/file/85097822644.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/56625779024.pdfIn PDF document text
    • http://rcot.by/pics/files/dololojisufotoza.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o5cctqb22qsisptu1jmc7red43/14390344240.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f5a8e5b535761c01ebbdb26f557a8f9/65974976801.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/97546785746.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eeae38062b51bdf014927dbfd205f99f/267284867.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1291dc63e---nomikanozanewe.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0465768cf8f71b6525460c2e16f90b76/8023293268.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3639ca44---nawevuvajagisow.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9fd4fe702c2e2bd538379ee349ad3edc/gupepururago.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a25ee5a4---tevosoruvimilawaduge.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61c09bd939---77706870203.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9f5f265437ef536299f47212cfe11753/66321954819.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lulugefidivu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001bf68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BF68 23664 bytes
SHA-256: 2b197d618d6f28a0c5acf7860b1da5afe9b0d829ac05ef3e74fcb7ea551fd4ef
font_00_sfnt_off000153d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D2 23828 bytes
SHA-256: 13a1a070ee8dde34701d0c9fe826c4fae4dfcc3a1301c63651ce7b58f8b75134
font_01_sfnt_off00018d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A585 11220 bytes
SHA-256: ca69fc244df4d1c95798fe1736645cf831d1fbf6ef70475c362b7659ddb16d27
font_04_sfnt_off0001ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA61 22636 bytes
SHA-256: c9a97e71f7903dbf0f4bf7d264d735e25c088aebf56df0a23b47e5ab24649ab7

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