Malicious PDF — malware analysis report

Static analysis result for SHA-256 1911fc856a18d45e…

MALICIOUS

PDF

99.9 KB Created: 2021-09-19 10:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e448cc7bef9c3d4c23a62627af70f79d SHA-1: 3196d430e7a35ad499513984cc0ce372ef54973b SHA-256: 1911fc856a18d45e5c0d71f41d7d02d5fefafb89cb415fa28b457d4e2378c3e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics further supports this, suggesting the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://pixomot.ru/uplcv?utm_term=number+symbols+copy+and+paste PDF link annotation
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146a7b8529e5---lovewadibebawoduzizuruxu.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/devezurezime.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/18067771175.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/17050469449.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/64573733696.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sifixupoxefivufijinex.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/27190255002.pdfIn PDF document text
    • http://vitrine-prof.com/files/88357392354.pdfIn PDF document text
    • http://school15-tyumen.ru/f/dipodofunujav.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/28818902887.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441ef713710---63791134592.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/42411775566.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c8391fe4cb687292ebc7a0efb49a7f4e/51107794853.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/26811320223.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/70734652474.pdfIn PDF document text
    • http://villkasz.hu/editor_up/rexugipokaga.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/58435261394.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/58451761948.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/gugufurokarom.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa553a66d2---92180577033.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/88400288436.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/857243b8626e935f6287461ab61a16f9/lapudij.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/89705246507.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210918001122.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000173b949---vekemakovepiwepela.pdfIn PDF document text
    • http://shosholoza.de/file/volatevovur.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/fololekej.pdfIn PDF document text
    • http://acrgroup.nl/userfiles/file/7814546191.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_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 24668 bytes
SHA-256: 2ae1ea002e1b95b4d87a121013ef4f7dc268f8562966e549db70a3bf05d2c5e5
font_01_sfnt_off0001501d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501D 10916 bytes
SHA-256: 471e2e66dfc77e327ceddb856db551ed8dda43235910dc1e1505f51ae034f800
font_02_sfnt_off0001693c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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