Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4ca16e4fb351bf…

MALICIOUS

PDF

102.6 KB Created: 2021-07-03 11:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac79ac1dfa528aa11ca72118542fc0b9 SHA-1: 86251aab4cbdfefd38ce9d12f295a97bd01d0cf4 SHA-256: ce4ca16e4fb351bfc923253d7c7a35096f8d46f0611baf2a430874029c1a0c92
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file likely serves as a lure to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d8cbed32fbd0074f45dd64e470ff7547/41631657823.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56d850bed---42266548731.pdfIn PDF document text
    • https://micsys.in/userfiles/file/xorebubevokasumetubokiwuz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hv9kutjcufn74tt1a5muqaugj3/guwowi.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/zofesikopukogar.pdfIn PDF document text
    • https://luminex.pl/upload/file/7270202689.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ajkcotra2pp1qglc6ol49700ut/tozezolix.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7c653a5d---14651558847.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eeeba6531---96692644923.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d1a439a3---53717269547.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/kugopixufaremevoz.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xiwonununakisosasefodogum.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2vaq8p2eh6olbi04c4msshgf8d/radokiluwurenunidenanob.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/34145063219.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0ebba1dde27a7836d45d416fd9228bc6/wuvalokepuvobi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gg8coreslkdi9nkdqjjae39l6b/59787395152.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ccd58db7---ripazo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/91fd2f46555aeefc48352151374d39b3/71034710256.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/rs47255h5aer574fjn2fd3ofn1/jebofuturadumuvudof.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e3a4c26e---xetuzawim.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097428dbbcb6---gomove.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3436131285---21961780252.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8avpjt223m0go3b58aip3cicfm/tamavenunube.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/82590496626.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/14459153797.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fd6c0cb740237730d37e5ec95fef57bc/jejirefivevupijalex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=formation+of+adjective+from+nounPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 10696 bytes
SHA-256: 8a8568606843b6d8f26796479475439931cb446f2a011e00eeba6abd2c50effb
font_01_sfnt_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 20784 bytes
SHA-256: dd5a0cdae68fc9c1e2a65ad5a7a783a964ed630b2d4c8217d5f6fb9e6924d118
font_02_sfnt_off00015ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000176ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EA 16188 bytes
SHA-256: 9d3a2c7f3cd7a845e425e22361150ca611a6b467aecbf2e15da520c4e09760d6