Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd2cf94c3d6ba04…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 17:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de4100a76bb837644b6fd599735e9a3f SHA-1: f3c37c3ec20c72c987005fc17413ff0707094e6a SHA-256: 7dd2cf94c3d6ba0496c2437d98ed81680273fa568726a1670d5e0b04e0353c78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript suggests an attempt to execute code or redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/h4v87579hamj8883k3h3cpfml5/24724761117.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/86974881876.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/15997415195.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/doregugav.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/35439438011.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/kepozojijala.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/5149832704.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/fapufet.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/6940653755.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/pafeputesupudifenatilo.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/xiloxidurokebukoj.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f8e53ad4c---fagukexaxoxezinebeni.pdfIn PDF document text
    • http://museeducuir.org/upload/files/voxulabarumexas.pdfIn PDF document text
    • http://edelstar-mos.ru/files/xazozolajixaxo.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/3042145874.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/12237031231.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/zulawaji.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ok2bucsqsdm9s4vo45vh5ettj2/70699205207.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/lijumifo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jb0f1np36nj329ihqi6tbfgr01/76635033171.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8292abkqgj7fugac00686mf6mr/ragetikufetipulas.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b650a52b3ce---texukewexir.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/sudum.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/60938005288.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021619154534134.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d39c31465a---jovamak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+chevrolet+captiva+2013+espa%C3%B1olPDF 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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 17588 bytes
SHA-256: d1a7845fa700ab3a339188b89a99b0281ca710fe52c0302408725da4233bfe8e
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 11304 bytes
SHA-256: 92e1beb6156211617ca4b5550f676d8c98ab389cb277e6100feb6717496d522e