Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9179b10efa388d0…

MALICIOUS

PDF

86.9 KB Created: 2021-10-09 19:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 20ec632284f1e218fadb67d535434de8 SHA-1: e0856c213658a71006979d7a265fda189ae53aa7 SHA-256: b9179b10efa388d09350f44d9527a48d54524406d98dbfc566c4f04855aa8978
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly indicate that the primary function is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161490440d7f19---balosevabajugi.pdf In PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rutadapetojidunixegufokex.pdfIn macro / runtime command snippet
    • https://fundacjaartfreeart.pl/userfiles/file/92086117931.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/37204652076.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16159fc80e41b6---4615186625.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45157521575.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fb049599afa158c937cb1cd65753a243/25545809586.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/bugonijujumirawe.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/57208499141.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210925235231.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/lizupoxakokidaduvip.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d825f57f---69872125677.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615fd34a2d090---47695535455.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/33061284137.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/sakenazobi.pdfIn PDF document text
    • https://kawanmto.net/contents/files/90741378206.pdfIn PDF document text
    • http://asja.ua/userfiles/file/metinidusubavabegemawupe.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/fatisurugezofikujab.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/jifufuwevineroviso.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109191020491888.pdfIn PDF document text
    • https://polytex.de/sites/default/files/13408088708.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/pigaligatafavufuga.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/p5112vtiknlqng7rgsenbf3cl7/dojebotagakoxunewafifezip.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614700ed96dff---bejajenusuriselatufato.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/59727751703.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/tizoravomejokesep.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=curly+pixie+cut+round+facePDF 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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10792 bytes
SHA-256: eb8993ff9861d378ba187569d5157767275622e371569d500e0814a5382daccc
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 17268 bytes
SHA-256: 3fad864cb0ff1b25b667d0b30c1835fe2ce4926f6e00dbcd16417048c0987cc6
font_02_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1