Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e55315505053a11…

MALICIOUS

PDF

86.0 KB Created: 2021-07-25 18:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9aa15f83910dcaaf3c2e3d5304484830 SHA-1: 30de0c3e6c506a05e7e9586e9a1cd5fca9347520 SHA-256: 4e55315505053a1123343e872a58a79cb9c5ed5bf30cdf88888c47ef33c82889
196 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 high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress sites, and employs a password-protected archive lure to conceal its payload. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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 https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f3aba49c571ce860cf25913d28b92622/lukumifuji.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5b09a1d2c68cb790ca1e37eca75aed11/9819319284.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c4902117b---95649589249.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/kegapo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/i60cd12h7lgapjvgmjnootrp0g/78384043327.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/itdu45v1jd9uf7iaoi6pmgdtk0/78011969531.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c4ac7a80fe8c344a07960218bf72c344/kopajojezaponof.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/22/file/20210722_230945_136.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5112f2592---depozesaxetilejap.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/79096558347.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nomiduvozotilodalewo.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/duvesosazitiwiporobaburi.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/wuzerofim.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d743feb570284dfa22d9b997f52272e/zewopafoda.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7877d291---vilubekikedekisodos.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/tavinofamivozalo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c87de54ec969b04a4abbe3a0139480ed/valopezebusavasodoni.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b44710c73b1---kuforovijuxunelosaluzutid.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/91785165988.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/44565559237.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/31898198968.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/24433401369.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/liwopepibowipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sharp+roku+tv+lost+remote+no+wifiPDF 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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 16596 bytes
SHA-256: 966055b91b6ca82de2cb5982c107a46416393e45e6f3c70fd8f69d99769e302f
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 11044 bytes
SHA-256: 5bbdfe8cc51bb32aa90ff2a33484f241e7524b9c75b4c2a9ba7fc7b21ab5beba

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