Malicious PDF — malware analysis report

Static analysis result for SHA-256 8129cc19f0301861…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 00:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d6a366aefff5f19621741f20513d86c SHA-1: af0d4b6fc4375d8e98569ca3135575c36db4e985 SHA-256: 8129cc19f030186175b636cb0c1e124fa2a50665bd039f0783373f58d1ef1636
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload storage and other disposable hosting further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://jshtextile.com/UserFiles/file///romidevijegamo.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/24891947811.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133efda646fc---vapejuxipoxanasefum.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/busiruzibozo.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/32819042979.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/togitifipuf.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/medexovupixo.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/mujefaponixiba.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319d2c9c1f7---90612360613.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/toxunowakib.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210902_042128.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/72348754238.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/23370849114.pdfIn PDF document text
    • https://jss-moms.si/upload/File/28317739839.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/lemekozujepusolipixokadev.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/82b0bd721abc15f075f36bff17191e49/19009866194.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/buvuwo.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/bogure.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/007b13bf5a831130a7e8503f64dd11c2/62374581058.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161381e1d63465---55417236146.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/68518764954.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109051208572787.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/1478671464.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/fesugotalowajemimil.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/5661421115.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/babofatekumobenukitik.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380329aa0da---64946557513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=x+plane+android+unlock+all+planesPDF 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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 18312 bytes
SHA-256: 0922d6b6dc993b57b4e6d8bf9b040abe32cb9084f878a45fb520d224e0a3b274
font_01_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 10608 bytes
SHA-256: fc21744cf9db0e04040c047a42dfc22090b971e3751b093b16227d92d561039a