Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cd4621a65dfe93…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 09:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18e594695c24c4971be90feb0db67936 SHA-1: 61e208c05f8441a7abf8c8d6d091d9d99924134f SHA-256: f7cd4621a65dfe9305d9772bfffa69cb99e8a074cecb420f51d53b39a09a4245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://hidrometa.com/images_upload/files/vilegemejajot.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161397827c7e21---wasazebem.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/kopujezoguxoxulaxadebodu.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/dobubojerosavowom.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210917220346.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/navamitudobod.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/metabizidogavivari.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/32541491117.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/sixagonozefekotozexi.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zanimazedalijabukuzisinaz.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/22715772060.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/25195054157.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/vanukivof.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/ziwunedowawelurizix.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa6d0348f---5220094729.pdfIn PDF document text
    • http://oilspecchem.com/files/60992590467.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zilotokulu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea166b0bd---febudurofalojedapozufi.pdfIn PDF document text
    • http://rts-3.ru/upload/files/68370745208.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/74357754074.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/nowuwet.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/24466966158.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58351f85f---zopunajurexofa.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/93199338004.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/97869853081.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/70pvij7ki84a74cc0jkrca3uep/varobigedipivexos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fake+gps+go+download+for+pokemon+goPDF 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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 10804 bytes
SHA-256: 0257d0f2cd097ec2923b321af76ef0590a5a413d2d5a3b4861ecbea2f62ab3c6
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 18224 bytes
SHA-256: 7fed27834d53240fbdd925d80af08e913250d44574ad90106fbef007c84f62e5
font_02_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1