Malicious PDF — malware analysis report

Static analysis result for SHA-256 d400bb7b19a83eed…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 09:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: eb47e28095e96ecbf5e47ea36c400c06 SHA-1: 63d0ce0c03c3a42ce4495577ae76ffe991e67b35 SHA-256: d400bb7b19a83eedcdae89a516f15023473836e81eab5b51fa34a90e5bf7cb60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to external resources, some of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://eltonltd.ru/sites/default/files/uploads/87490849732.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ha4fqamvfimk0qjgf7ekutd2su/18179412981.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/35891935740.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rgahjp8vhb10dfjvqb7p0h8ot3/zevuborewovibit.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f8473db4c7c010676bda115437762988/bijeturorobatipala.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccsnnsg3pn0v6k9n6khkno7v5s/degigufasuroxamove.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/xalitaf.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/cjhbqfupdpm7l9oar8supkeh66/subajod.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/xefowapin.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/21297605688.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/10562766725.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3uus107ss1mss0jisag0duss61/divakoxoxeponex.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/wamagumura.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/41489837120.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/tetikoterawonowera.pdfIn PDF document text
    • http://thongthien.vn/upload/files/godipifilekipinadevo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/57414d3c41d1ce886a2784e0d53327e8/88205307278.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609239c24dbea---63464176964.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a388ecd3221---jufugumiwagelodewetava.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55104bc2f---83112255546.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/36121853007.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60008e5dccf756e37fbd391979f0fe34/pusopezazunejuwedogi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160758e9d96be7---sugivututunus.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/60087160830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nalayira+divya+prabandham+lyrics+in+tamil+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/aa1b719c7ce3e1d4f4737973df555e05/58664351465.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 20736 bytes
SHA-256: 0c2c18981037f473fbea298590492cb906b62aefd08e8f7b484538c7fe830b76
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10928 bytes
SHA-256: e99a33820ea2f2e31f1b29a6272307c32dab25976db1ec73b1ac3bbe768e1591
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 7608 bytes
SHA-256: 634b2fe80421831a4c7d94a7bbaa232de028685703c331ad2a7fd34fe235e1de
font_03_sfnt_off00013b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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