Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4cf5f8e0415cba…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 12:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9521d853337128b2d526d0fc25b2f02 SHA-1: 68262f2f5d9c906ef19e96446a172da4e94f5912 SHA-256: dc4cf5f8e0415cba5a55140b74c1fb0ce74d8c450c77664ad1152426ab11363f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to disposable hosting, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a method to bypass gateway scanning. While no scripts were directly extracted, the presence of PDF-related heuristics and embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://planbmedia.hufiles/40449422270.pdf In PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/70252382443.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/33455614706.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/tutafexexuzubajalajeb.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/ziberowilajuf.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28b0eee54f---nutiwadabisetiluz.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9965ae3ee79aa4460008737852c51425/46996914823.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095304bf0195---salexefegitutaromatariv.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb641e71c0d---vosido.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/kigawubujapezuvagi.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/memimajamakusaxiwitikabo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/85261790e33ba12416752f5bc81e0755/26440495951.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///92892434020.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5310db3f---48173233352.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/guzujigaguwusezisade.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4554cae89---9179730516.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748756558b---5050921868.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a18cb13bc66---bateligemawobu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/h4sknob5h3u6695adl3344mue1/wabitekunawofinetilun.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea49d2c3a0---59002341849.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/laxiref.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/bapaniguraturatefezuwe.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b196eb3e17---pupofopukofudizaduzufifi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/wagajuvi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719de764cd3---zuvulamuxugowebemoxo.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/18486641650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=online+image+to+pdf+converter+i+love+pdfPDF 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_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 10888 bytes
SHA-256: 2ba0f952312c74ee391ff152e42959ec4ad4c2d4b55174b1c7813c8fc9829cfd
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 17708 bytes
SHA-256: 9a0e5aeeebb394b1fa6a33e142a4037990c80cb5ac2f7d6cc720f9c5a01dc06b

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