Malicious PDF — malware analysis report

Static analysis result for SHA-256 378a3434f1a84c99…

MALICIOUS

PDF

91.9 KB Created: 2021-06-23 07:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5e9a9834d0f55c0c87056cc8dd466cbf SHA-1: 71be83ca7e08b1f2b226d24b1887487f1a2185f5 SHA-256: 378a3434f1a84c996d36bd1a9007d0ea020ee25a4c5338bfd9c526d2b7eef523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f6f2f5191181334ee85eb2475b7679be/gazuxusu.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/df07394f8bfe2695ca0f7ab6c2a79dd7/giwuxeluvavejetuvanozifo.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/buromebasos.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3fd5d17ae7880615bf74dcac35a36815/66585068354.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d7b0bda1b8d13b6b1fdb56b10bcee6f9/nogosadijobizitemaje.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/wedufopotosazunonuzaxe.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/30665196028.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h68sq5nbfg6ce5oj03qi0sstj7/60802357937.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/mivexifoworo.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/ledalu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d8ca14fb172b6a8cce12c123df04acdb/51425509262.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0fde86738427a9ec3c396713e2682990/dabisusikixojop.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377054023f---kodijogigukuxeme.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/zorusuwa.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/robufimimiwin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=song+template+instagramPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 5240 bytes
SHA-256: 1240efc55284e993994a7545d256083047e85719b294650cceb384d88ddb238b
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 4432 bytes
SHA-256: d41ac81e14da684500e62fec930aa962a0509fd15c96f80deeab03604111b84a
font_03_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 11364 bytes
SHA-256: 380c3dc6097037956e11ea2016cd43a0ebb66c158abde7bd0f98fd1447cd7ee6
font_04_sfnt_off00014a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9C 16248 bytes
SHA-256: 6afd9373d62414a7eacbbbc5ec0c9969bd3d6c1d0944ca6da1490b27c5b3284e

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