Malicious PDF — malware analysis report

Static analysis result for SHA-256 738e840de71d5957…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 12:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7281730b920b43b75f8abea732966ebb SHA-1: 076c7fbec5e7a9d6d1197e2cc58c8a915b333f9a SHA-256: 738e840de71d5957444bb26816836d4e7b9b88d033c0b2167e4d4c6516472cad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=download+vector+game+apk PDF link annotation
    • https://bakotech.at/uploads/ckeditor/files/ropuwokokivijeburilix.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zedalopojofu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3d874c2e---25508510233.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/fexuzanopenavale.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/12920348019.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93003583831.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/numusijadivuniwef.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/56209056937.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/46837431005.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/55331611696.pdfIn PDF document text
    • http://slovoveri.org/userfiles/23822840365.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/natute.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/97015261369.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/38813493450.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/58735351836.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/polelepomexagobuk.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/97259004464.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/pofoji.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210904153127.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147afc9bafb5---lavuwuwifumivarati.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/13292473900.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb16aa97a4---24234164253.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/95563735368.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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 18108 bytes
SHA-256: e0ca4953f813a49a3a07ea37dab64930e76d8389d38076fe29e1e5156a664383
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 10844 bytes
SHA-256: 4477a3cc24ab3c608cfb1ed2ac1b245bbc1709f24e0c820c264251f9b9d812b7
font_02_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1