Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13700b38d4d86a5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 17:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 101c35217c64a00ae7852a7da949b072 SHA-1: 0622170367df5adc071c2ac521a8aab379681ba0 SHA-256: a13700b38d4d86a529751f7abbd84770f7e1d7ddc2230ba91ce0d15bc1e7e100
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://mobilaide.com/upload/editor/file/63506550330.pdf In PDF document text
    • http://psychologadamczak.pl/userfiles/file/wosorigosanapimaje.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/jigozajidoripokeraleke.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a46c08ada2e9881ad85a9be624d41e35/63370399489.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632646011.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/18040424395.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/36806491232.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nejuwokezigedesifovane.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/puzimetirekawuzozimap.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9ad855a52a96bc1e92c37e20015f31d2/gimejevikaje.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/wijiwurika.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/59539672118.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/562c5c09d02c299c6f37b04253965d6b/64347887605.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161438afc36078---4371275235.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/zoxabiwujusazet.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/suvibukubereketakiwe.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/wiwedunavuzupebiruvobib.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/podakewilowefolovin.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/femubufotupogidifej.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1276431613614390c32271e.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151277934476---foxes.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/345232cd371cc92ca2bb0dba833e76e9/mafadakoritinujeretatoziv.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210924012337.pdfIn PDF document text
    • http://cartopack.com/Images/file/12483874547.pdfIn PDF document text
    • http://fitviewer.info/files/file/fajawe.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/11534846805.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/panewatiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mi+a2+problemsPDF 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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 10464 bytes
SHA-256: da7794653ed942263ab91726b320b191bad32e95e49b5d38711cc795e10cfdfa
font_01_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 15552 bytes
SHA-256: d32adf6c836ac2eed1bda3a7e10062326c3dd6721f75fc758be42171c0c6f0be
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1