Malicious PDF — malware analysis report

Static analysis result for SHA-256 28313510a55ff28b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 02:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 977f3c28a62f2467d131e8a5e4b0152e SHA-1: f58d1bfdfc1be2e1ada3d88927d6fb1d51fe5800 SHA-256: 28313510a55ff28bfcdc9169d9d43e399905a1f0830a5fab7600ffa5b69bdcdc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the presence of multiple links to potentially malicious or SEO-manipulated content suggests a coordinated effort to redirect users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607babe159deb---9079333095.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1e669f01---27503814711.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210730_008B6D72F0462693.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb86d71535---5514210825.pdfIn PDF document text
    • http://otczenacts.com/media/files/pijovotu.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/21246527818.pdfIn PDF document text
    • http://placc.info/up_image/30096310605.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96e8e8c0f---24754556432.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/karurafezixiwet.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/25828378604.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/savozepi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4df8a4c93---zolivu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/xaputodikatabegiza.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875329552f---puwafamitusupar.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/t6e5huidcsiaj05dg3nod9islh/55967917839.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22eb6d593---568768201.pdfIn PDF document text
    • https://ewt.cz/res/file/3764351283.pdfIn PDF document text
    • http://robedecreateur.com/img/files/davex.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/86839890309.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mibilaw.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/fazoradazineduwom.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/femidojizefagowuzixof.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/bilasam.pdfIn PDF document text
    • http://camonetinternational.com/files/file/77972231184.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/50281750932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=field+of+gold+chordPDF 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_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 17792 bytes
SHA-256: e5540ba1a5b2ddb0c47b16fb38e1ecea66a50a9f3f2c9fd8cf8716f8f69474ad
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 10200 bytes
SHA-256: 28a0bf073501800d8adde0ae33efea9b544c36b44774db161e41dc4f9cf429be
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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