Malicious PDF — malware analysis report

Static analysis result for SHA-256 105d81ff84daefa8…

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 04:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 395aefa7c50b409549a1728848a0fd38 SHA-1: 1b1574ef17c6c01c983b0084593adb00298f79f7 SHA-256: 105d81ff84daefa8827ca2bdcc190e4a0c3ce69cbfc11a71e697a3cff1c22480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=boiler+going+on+and+off PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/07b12a9ce6e879d29f53a3a73b2648a0/60678305269.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2927ba6ff16fa6712b263d3799c1d367/94803460912.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebcdce7e45---92906228372.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/3rbvj2ce0a7in08umpsn9jq790/65286464761.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/13244918259.pdfIn PDF document text
    • http://texmet.pl/userimages/file/12216908042.pdfIn PDF document text
    • https://atl-50.com/files/file/31659849664.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd05c99f1---53511712943.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511222035.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/paduk.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d0391c977---watij.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/tobaxoxabel.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/2394917963.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a327c4dfc---karefeked.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/vemikudejimozakusokura.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/72144063376.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076a948cfc2c---xejafafewudobirofoz.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jamufopoveninuwuvuti.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a238d495e39748916f489abf050cb70b/86341840272.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/werapepibaguj.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/640d082d29320f317d47054b4db97f34/zadobumezitaruga.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082486305b49---revedowel.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215fadfa3---59405449540.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/77039514236.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/kobapewitekujevebi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 10316 bytes
SHA-256: e308ba6c8ef850588468ae0bc9a99db758f6ed8413c5d4c17f9e526fbd8471e4
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 16868 bytes
SHA-256: f4c27854ead910936978c134f9bf5361302fc9483401fb5ac6e10cec7463fabc
font_02_sfnt_off00013164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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