Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f44d0feca313807…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 03:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee2363da19a945c83dd26e6df43b85b4 SHA-1: cfa70fa932edfa0601c592ca861a9bcf808c56c6 SHA-256: 5f44d0feca313807396ae27ca092ad47a42000f9535540e58a52adb083d2584d
196 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. This technique is often used to evade security scanners by encrypting the malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=ethical+hacking+books+2019+pdf PDF link annotation
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160756831852a8---roziretajegosolurer.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/12890425582.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/tesuxunijumab.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160917c2d0bfe2---77517990923.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/17240381779.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f82da5d37---nufudosetej.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ba12d80d11a8f2bddbcf8978d3910333/gusirafaxesuvewilife.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/04ef8427160a69ae1abaf9d305d8a394/55893879576.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ih6tc5k91c5hf03vhfluq9c8h4/7951218819.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/32316474230.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095b7ce598ea---xexis.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xuwurugevugiborugexijafa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612b77fd639f1---16957282628.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/laselola.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ue6nq3u68on6anuhknmbrc1ott/mumazaj.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/67722546002.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/56623590051.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/zazanuwekafana.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210602_71F3CEC173C9DF4C.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294d552b727---togiwetiwofudazozitum.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/99241972933.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b381fd52b9---92466010920.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/p7unm8sl06p6lo99rqi46t4is9/40200361405.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_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 11344 bytes
SHA-256: c6252e3aa02f0f27a4ebd2fb4846e5669056a3c18ea13379d22bd06b82922329
font_02_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 17556 bytes
SHA-256: f244821507e6a744f9a582e63e03f39d43ed815b2ac1878dd770d46ddd47e688