Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee6ac7d3f621885…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 01:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ddcd48f209145cc25b1ac96c294f8f9 SHA-1: 7e280a7c8baae7c4a0cb18c29672c41a2ca193fc SHA-256: fee6ac7d3f62188586ce20558f82e88bac15137ee7c0aa60dd5ec98015fdc734
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://damiel.eu/userfiles/file/88287189302.pdf In PDF document text
    • http://superfishinglewood.com/uploads/files/91424181908.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eae64055b---26028433647.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vph7bdhehp6l677t085chlla3u/26898076799.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0daff334f---makojiwivepidolavuk.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/wisevek.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/xujavirizaranawex.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2009c45e46d0c3a573a3dba48d217f4/83082124248.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/28346238622.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6028cb85---kisiliguninoxeririmom.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/32772421104.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddaebc752e---12804246537.pdfIn PDF document text
    • http://npas.ru/pic/file/56328260004.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cedf1a25103---dinitesasoxi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0f4cc4484905ed7acad2900c05385aa7/53743268541.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e0c10a40---lotasijobonanozadelor.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c065b63fd62---xiritegevimufapoxosofeko.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/854891b26f6ced7b7fbb8e94e9f7d98e/vifosabugipasuvudijobis.pdfIn PDF document text
    • http://abnicum.ru/files/file/71234265057.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-13/20210513233716105897.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/79201275859.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/rokugun.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/42801461402.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fd6be332---towami.pdfIn PDF document text
    • https://argumentua.com/i/file/44546717637.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/61904171139.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e909d602---29520648729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=agenda+2030+pdf+colombiaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 19808 bytes
SHA-256: dc683a7de99a520868b28fb2e6dbcf539a8ca4cbfc69d85de3b7e3afe80382b0
font_01_sfnt_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 11132 bytes
SHA-256: 915d256cf18bfbeb1619456d5b6e1b0b00b64c40ebadc89543a3b3b749425d11
font_02_sfnt_off000152ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1