Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4dbd7ee3599f1b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 00:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5531872423fbeee76b59fa6003753ba0 SHA-1: 3c99a22bd25fca57cc8e8df35a53067560947681 SHA-256: 2b4dbd7ee3599f1bcaf217f1763d91147c0b5df8b6c25b146e75dc6b2f0f48d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://hcstonetw.com/uploads/files/202109061254195536.pdf In PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/6972412688.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/bawotuvubarul.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/645e739f514b809fd944c89dea631f2a/55696631813.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/492b7d3a8a98d9a01b13e5d31614789c/rimulowe.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/xomufotojajidodibejeza.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7309b3e5e---bikewataxamorowewi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a97554fb5022717eeff21d500002c327/zezevebewuwikajiwig.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xelapevuvubimolifimos.pdfIn PDF document text
    • https://buyafranchise.org/files/files/3097192991.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/46012585611.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc490842ba---jenuxedizebenamesemez.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/98658793533.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/77206533262.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/jotakazifejaxobiranimeni.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/70943599448.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/87992380294.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/napezedifepajavabul.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202197714486559.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/94219477032.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/sepubamufoxiligudawi.pdfIn PDF document text
    • http://dhf-china.com/d/files/pumowexugitonadasuwukajo.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/30001539553.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/66264193069.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/13652053576.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/zebotun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dosti+purani+picturePDF 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_off0000b96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96C 16880 bytes
SHA-256: 94381f2aab7267b2bcd4f9740f67a748b4b4117bd5ced9daa5c6be0d48ae16a5
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 10424 bytes
SHA-256: 5982b68fd6e25644200d5f78d4b787adb88c4b6f5238ed31662ba7747e257289

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