Malicious PDF — malware analysis report

Static analysis result for SHA-256 993baf05480375f8…

MALICIOUS

PDF

89.2 KB Created: 2021-09-19 11:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1a77be16af3bae9caebb8609c0eba07 SHA-1: 59b3a63602903499bacb9a62365efc14236a1d24 SHA-256: 993baf05480375f8ae70b695e1162f54aa05f3b4377998559fb258ffd9008a30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised websites or are part of a link farm designed to mislead users. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=how+to+extract+data+from+android+phone+with+broken+screen PDF link annotation
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/67682109792.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/sanolonitodubogepizova.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/rejurese.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jeretesesemodibigixofite.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/gapimev.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/zoxexutawojo.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/fekakat.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/36434886972.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/xiresikuvegaleral.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/49129347058.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/nazemakedax.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/xalukivosa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161340500df0b8---28130847126.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee6fcd197---pasefurasovegukune.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/diximugupigekarolujapu.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/nomezanuvofigojetujiwen.pdfIn PDF document text
    • http://retrofotr.cz/files/file/gobolere.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/menara.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426888e01d---35511733246.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/42929489316.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dfgku065conqp9n43qtf56nbqb/56692954253.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/88249702478.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381979cca0a---46616778284.pdfIn PDF document text
    • http://skisun.it/userfiles/files/xekibexolerefebixe.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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 11248 bytes
SHA-256: 8268fab018d259d1188fb2867b904b0a5905e9b931489e7ecb3d21662300ce4c
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 18312 bytes
SHA-256: 6f5f196c4e760a12c28884e9b7997ee1564fb816028d6dbb7703fda61a0d55c2

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