Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69f623cfb7fa8f6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 10:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a34f26ebdb916f27c0c9e0f75f272e13 SHA-1: 2cc1157e7ba95c06ed96c2baf0280b29391d64c2 SHA-256: f69f623cfb7fa8f69a4c81ddcb51fe99f1035d7e295ef48a65affd2a1fe22fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=modern+business+process+automation+pdf', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=modern+business+process+automation+pdf PDF link annotation
    • http://01host.ru/userfiles/files/6213747824.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/kibofanemivetumulel.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dee5e6fe1o88c7dfnfbmi079g2/nifixujatadawopox.pdfIn PDF document text
    • https://vestol.bg/files/file/99390156718.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/fibitokotexemuwipuxofobab.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/xojaresub.pdfIn PDF document text
    • https://artenika.pl/fck/file/61814855050.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/54cc0aec65ef21a948ff69ae3ebb66ba/lojubinowa.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t0dnugnp5856qg020kaptbbpkt/revisivefuvizofividus.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/94efff571153e77240ae0d12f4121348/5490630956.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/47301637932.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bk66kjn9jo5p01gprpe2ncd0bm/40630887128.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/97266130840.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e37ccda78e7d237f3cd69216a2f7df4d/xikez.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/52698434406.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b07841b2---96828340513.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/24145439392.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/xivowoma.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/61vohlf68irdde18brgrejt483/demalivimaviretizaninu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4c1dabf956708cccb703104afa2631bd/gasaramiz.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/32365302854.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0l0eimfmrqqmokvg153q4ae2nm/ligezozutemamibepupuj.pdfIn PDF document text
    • https://magerp.org/upload/files/mimenizolinekixede.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/20967750320.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fab283fb---50590991400.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/30795758320.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vadilixudutudibawujaz.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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 10968 bytes
SHA-256: 020235a2dad468cdb6d4a1c650956fdf1b2387cf15f7666d8f712cc51e3a79f6
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 17708 bytes
SHA-256: 4f866b6137795c8fda134e53977699dddae06b7237636fc84f4a2a9ee6f0c771
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1